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  • 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.
11

The proliferation of aerospace weapons technology ballistic missiles and the case of Brazil /

Vossen, Terrence John, January 1993 (has links)
Thesis (M.A.)--Carleton University, 1993. / Includes bibliographical references (leaves 128-136).
12

Faktory ovlivňující úspěch omezování vývoje a používání technologií / Factors influencing the success of restricting the development and use of technology

Hanzl, Ondřej January 2021 (has links)
The primary goal of this thesis is to analyze and compare the impact of political and technological influences on the breakdown of disarmament efforts between the two world wars. This issue is approached by analyzing the string of disarmament conferences that took place in the interwar period and restrictions placed on the German military imposed by the Treaty of Versailles. The theory that serves both as inspiration and a tool to examine the subject is the Actor-network theory originating from École nationale supérieure des mines de Paris. This theory is used to view the subject in a new light. The author places military technology, the political movement of disarmament, and especially restrictions of Germany on par with states and international organizations. While the political turmoil and causes and effects are well researched and documented, the technological aspects of the issue less so. The author asks if the disarmament efforts were realistic in their scope. Whether a state abiding by the new rules could even mount a feasible defence in a case of attack and retain offensive capabilities. Whether the technology itself allowed the existence of alternative weapon systems not breaking these rules. And in the case of Germany, whether these restrictions were effectively limiting German potential...
13

Adaptive Evolution of piRNA pathway in Drosophila

Parhad, Swapnil S. 31 May 2018 (has links)
Major fraction of eukaryotic genomes is composed of transposons. Mobilization of these transposons leads to mutations and genomic instability. In animals, these selfish genetic elements are regulated by a class of small RNAs called PIWI interacting RNAs (piRNAs). Thus host piRNA pathway acts as a defense against pathogenic transposons. Many piRNA pathway genes are rapidly evolving indicating that they are involved in a host-pathogen arms race. In my thesis, I investigated the nature of this arms race by checking functional consequences of the sequence diversity in piRNA pathway genes. In order to study the functional consequences of the divergence in piRNA pathway genes, we swapped piRNA pathway genes between two sibling Drosophila species, Drosophila melanogaster and Drosophila simulans. We focused on RDC complex, composed of Rhino, Deadlock and Cutoff, which specifies piRNA clusters and regulates transcription from clusters. None of the D. simulans RDC complex proteins function in D. melanogaster. Rhino and Deadlock interact and colocalize in D. simulans and D. melanogaster, but D. simulans Rhino does not bind D. melanogaster Deadlock, due to substitutions in the rapidly evolving Shadow domain. Cutoff from D. simulans stably binds and traps D. melanogaster Deadlock. Adaptive evolution has thus generated cross-species incompatibilities in the piRNA pathway which may contribute in reproductive isolation.
14

An Interactive Theory of Power Projection: Naval Power Shift, The Contagion Effect, and Alignment Opportunity

Oh, Inhwan January 2024 (has links)
Thesis advisor: Robert Ross / Military balance of power and geographical proximity are two key factors that shape thelikelihood of war and peace in the realist paradigm. However, the empirical cases associated with the leading sea power and a naval challenger sometimes are not congruent to systemic anticipations of both the balance of power theory and hegemonic shift theories. Why do the leading sea power and a challenger fight a war despite naval power disparity and geographical distance? Conversely, how do these powers arrive at a strategic settlement even with naval power parity and geographical proximity? More practically, under what conditions are the U.S. and China more likely to avoid or end up in a war as China’s naval overtake looms large in the Asia-Pacific? To address these questions, I construct a mid-range theory, An Interactive Theory of Power Projection, that incorporates the geographical dimension of power projection in determining the outcome of naval power shifts. Specifically, I conduct comparative historical case studies of the two Anglo-French dyads (1856-1870/1882-1904) and the U.S.-Japan dyad (1921-1941) with a goal of developing a theory to apply to U.S.-China relations. At root, I argue that the outcome of a naval power transition is contingent upon two conditions: (1) the interactive dynamics of a challenger’s expansion and the leading sea power’s expectation about its contagion effect on the first line of maritime defense; and (2) whether alignment opportunity, shaped by third common threats and available allies in the theaters of the power transition, is open or closed. The contagion effect refers to three kinds of possibilities in the event of a challenger’s occupation: (1) an occupation will become a stepping stone on which a challenger further expands into the adjacent first line of maritime defense; (2) an occupation will produce a negative second-order effect on the other, possibly distant, first line of maritime defense; (3) an occupation will undermine or remove local allies on the first line of maritime defense. I argue that while bilateral resource-extraction capacities initiate or end a naval arms race, it is the interactive dynamics of geographical power projection as well as alignment opportunity in the theater of the naval challenge that bring a conflict to the fore and determine its outcome. These findings carry policy implications for U.S.-China relations and U.S. foreign policy. / Thesis (PhD) — Boston College, 2024. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Political Science.
15

For God and Reagan: The New Christian Right and the Nuclear Arms Race

Hatfield, Jeremy R. January 2007 (has links)
No description available.
16

The impact of US-China relations on Taiwan's military spending (1966-1992).

Yu, Tsung-Chi Max 05 1900 (has links)
Previous research has shown that Taiwan's military spending is affected either by China's military buildup or the US's military pipeline. This study investigates whether it is also true an ongoing US-China relationship has dynamic effects. Three major findings are obtained from the statistical analyses. First and foremost, the level of US-China conflict has a contemporaneous positive effect on Taiwan's military spending. Second, the analyses also indicate that the volatility of US-China relations has negative effects on Taiwan's military spending. This finding suggests that instability in US-China relations will prompt Taiwan to decrease its military spending due to a higher amount of perceived security on the one hand, and Taiwan wants to avoid further provoking China on the other. Third, analyses indicate that an error correction model fares better than a simple budgetary incremental model in explaining the re-equilibrating effects of GNP growth on Taiwan's military spending. Overall, the results demonstrate the interplay of domestic and international constraints and may help to predict what will be the expected military spending when Taiwan's economy changes. I suggest that Taiwan's military spending is likely to be influenced by US-China relations as well as by foreign investment and domestic economic constraints as long as the United States policy toward the Taiwan problem remains unchanged.
17

Anledningar till staters anskaffande och behållande av kärnvapen och faktorer som påverkar staters kärnvapenpolitik

Hagström, Christoffer January 2008 (has links)
<p>The purpose of this thesis is to explain why states obtain nuclear weapons and the role various</p><p>actors and interests play in the making of states´ nuclear policies. The main questions are as</p><p>follows: (1) What big theories exist concerning states obtaining nuclear weapon and nuclear</p><p>armament in International Relations and what relevance do they have of the post cold-war period?,</p><p>(2) What is the meaning of the perspective of the Military-Industrial Complex (MIC)?, and (3)Are</p><p>there empirical studies which supports the existence of a MIC in the United States?</p><p>The focus lies on actors and driving forces that are internal to states and it is also important to</p><p>investigate if the theories have relevance for the post 9/11-era. The study uses the method of</p><p>qualitative literature-study with some quantitative segments. It is claimed that states might be</p><p>interested in justifying their behaviour in a morally appealing way and that real reasons may be</p><p>hidden. There are many reasons for states to obtain and keep nuclear weapons and related</p><p>technology (which includes many of the most lucrative elements of the arms industry´s sales).</p><p>Among this reasons are that arms and related technology may be used to influence other states and</p><p>nuclear weapons-construction and modernisation might be used to protect the state from external</p><p>threats, stop unwanted interference from other actors, secure job and gain recognition and prestige</p><p>in world politics. For security reasons states might hold onto their own nuclear weapons and try to</p><p>hinder other actors from getting access to them. The internal actors and driving forces we look at</p><p>are bureaucratic, economical and political, and the MIC-perspective. The military can be said to</p><p>have interests in as much resources and capabilities as possible, which includes advanced</p><p>weaponary such as nuclear weapons and related technologies, at its disposal because of the goal to</p><p>defend the state from all possible threats and for officers career reasons. Much of its influence is</p><p>said to come from its expert knowledge and position and it is said to be especially influential in</p><p>matters of foreign policy, military spending and foreign policy. The major economical actors</p><p>mentioned are big corporations involved in military spending and these have interests in</p><p>maximizing profits. Nuclear weapons making and maintenance and the related areas of missile</p><p>defense and delivering methods for nuclear weapons seem to be areas with high changes of being</p><p>profitable for the involved major companies. The actors wield influence for example through</p><p>lobbying and campaign contributions. An economic driving force claim is that state spending is</p><p>necessary for stimulating the economy and defense spending is easily justified in other ways.</p><p>Political actors and driving forces concerns politicians interest in promoting the interests of</p><p>supporting groups, there are indications that the weapon industry is such a group. Research have</p><p>shown various results about the extent politicians tend to further the interests of supporting groups.</p><p>The MIC-perspective talks about groups with interest in high levels of military spending. Most</p><p>researchers seem to agree that the complex exists but there are different opinions about what actors</p><p>belongs to it and its power on various issues. There is some mention of the core of the complex</p><p>consisting of such internal actors as mentioned above. MIC-related empirical research has been</p><p>conducted and this author finds that the MIC is a relevant analytical tool for the post cold war – and</p><p>9/11 era.</p>
18

Taxonomy, phylogeny, and secondary sexual character evolution of diving beetles, focusing on the genus Acilius

Bergsten, Johannes January 2005 (has links)
<p>Sexual conflict can lead to antagonistic coevolution between the sexes, but empirical examples are few. In this thesis secondary sexual characters in diving beetles are interpreted in the light of sexual conflict theory. Whether the male tarsal suction cups and female dorsal modifications are involved in a coevolutionary arms race is tested in two ways. First eight populations of a species with dimorphic females that varied in frequency of the morphs were investigated and male tarsal characteristics quantified. The frequency of female morphs is shown to be significantly correlated to the average number and size of male tarsal suction cups in the population, a prediction of the arms race hypothesis. Second, the hypothesis is tested in a phylogenetic perspective by optimizing the secondary sexual characters on a phylogeny. A full taxonomic revision of the genus <i>Acilius</i> is presented, including new synonyms, lectotype designations, geographic distributions based on more than five thousand examined museum specimens and the description of a new species from northeastern USA. Specimens of all species (except one possibly extinct that failed to be found in Yunnan, China 2000), were field collected between 2000 and 2003 in Sardinia, Sweden, Russia, Honshu and Hokkaido in Japan, New York, Maryland, California and Alberta. Three genes (CO1, H3 and Wingless) were sequenced from the fresh material as well as scoring a morphological character matrix all of which was used to derive a robust and complete hypothesis of the phylogenetic relationship in the group. The phylogeny was derived using Bayesian phylogenetics with Markov Chain Monte Carlo techniques and received a posterior probability of 0.85. Changes in male and female characters turned out to be perfectly correlated across the phylogeny, providing one of the best empirical examples to date of an antagonistic arms race between the sexes in a group of organisms. Finally, a review of a pitfall to phylogenetic analysis known under the name long-branch attraction (LBA), is provided. The problem is well known theoretically but has been questioned to occur in real data, and LBA has been in the core center of the hard debate between parsimony and likelihood advocates since different inference methods vary in sensitivity to the phenomenon. Most important conclusions from the review are; LBA is very common in real data, and is most often introduced with the inclusion of outgroups that almost always provide long branches, pulling down long terminal ingroup branches towards the root. Therefore it is recommended to always run analyses with and without outgroups. Taxon sampling is very important to avoid the pitfall as well as including different kind of data, especially morphological data, i.e. many LBA-affected conclusions have recently been reached by analyses of few taxa with complete genomes. Long-branch extraction (incl. outgroup exclusion), methodological disconcordance (parsimony vs modelbased), separate partition analyses (morphology vs molecules, codon positions, genes, etc), parametric simulation (incl. random outgroups), and split graphs are available relevant methods for the detection of LBA that should be used in combinations, because none alone is enough to stipulate LBA.</p>
19

Taxonomy, phylogeny, and secondary sexual character evolution of diving beetles, focusing on the genus Acilius

Bergsten, Johannes January 2005 (has links)
Sexual conflict can lead to antagonistic coevolution between the sexes, but empirical examples are few. In this thesis secondary sexual characters in diving beetles are interpreted in the light of sexual conflict theory. Whether the male tarsal suction cups and female dorsal modifications are involved in a coevolutionary arms race is tested in two ways. First eight populations of a species with dimorphic females that varied in frequency of the morphs were investigated and male tarsal characteristics quantified. The frequency of female morphs is shown to be significantly correlated to the average number and size of male tarsal suction cups in the population, a prediction of the arms race hypothesis. Second, the hypothesis is tested in a phylogenetic perspective by optimizing the secondary sexual characters on a phylogeny. A full taxonomic revision of the genus Acilius is presented, including new synonyms, lectotype designations, geographic distributions based on more than five thousand examined museum specimens and the description of a new species from northeastern USA. Specimens of all species (except one possibly extinct that failed to be found in Yunnan, China 2000), were field collected between 2000 and 2003 in Sardinia, Sweden, Russia, Honshu and Hokkaido in Japan, New York, Maryland, California and Alberta. Three genes (CO1, H3 and Wingless) were sequenced from the fresh material as well as scoring a morphological character matrix all of which was used to derive a robust and complete hypothesis of the phylogenetic relationship in the group. The phylogeny was derived using Bayesian phylogenetics with Markov Chain Monte Carlo techniques and received a posterior probability of 0.85. Changes in male and female characters turned out to be perfectly correlated across the phylogeny, providing one of the best empirical examples to date of an antagonistic arms race between the sexes in a group of organisms. Finally, a review of a pitfall to phylogenetic analysis known under the name long-branch attraction (LBA), is provided. The problem is well known theoretically but has been questioned to occur in real data, and LBA has been in the core center of the hard debate between parsimony and likelihood advocates since different inference methods vary in sensitivity to the phenomenon. Most important conclusions from the review are; LBA is very common in real data, and is most often introduced with the inclusion of outgroups that almost always provide long branches, pulling down long terminal ingroup branches towards the root. Therefore it is recommended to always run analyses with and without outgroups. Taxon sampling is very important to avoid the pitfall as well as including different kind of data, especially morphological data, i.e. many LBA-affected conclusions have recently been reached by analyses of few taxa with complete genomes. Long-branch extraction (incl. outgroup exclusion), methodological disconcordance (parsimony vs modelbased), separate partition analyses (morphology vs molecules, codon positions, genes, etc), parametric simulation (incl. random outgroups), and split graphs are available relevant methods for the detection of LBA that should be used in combinations, because none alone is enough to stipulate LBA.
20

Media frames of artificial intelligence : A comparative study between USA and China

Wartiainen, Michelle January 2020 (has links)
This thesis studies the frequency in which certain views regarding artificial intelligence appear in American and Chinese newspapers. Given the general lack of studies focusing on media frames in the world’s two leading AI superpowers, this thesis contributes to the research on how AI is covered, and how it might relate to the international context. By examining survey data and previous literature, key frames are identified which can be assumed to affect the public’s perception of artificial intelligence. The analytical tool was used in a small-scale quantitative content analysis of 96 newspaper articles. If brief, the results show that the most frequent views of artificial intelligence is expressed in geopolitical, economic, and cultural terms. American newspapers have a higher mention of frames relating to ethics, discrimination and accountability. Furthermore, the results indicate that AI industry products are not as commonly mentioned as previous research have shown. Few articles mentioned artificial intelligence from a dystopian or utopian standpoint. The findings suggest that the reporting about artificial intelligence is not as focused on the AI technologies, but rather how AI as an adopted concept will be a tool, used for national strategies, and hence relevant to include when conducting future studies on artificial intelligence in media.

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