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A gun barrels performance can only be considered satisfactory provided there is sufficient heat-dissipation, thus not hindering the tactical use of the unit and the weapon itself. The added energy to the barrel can potentially permanently change the material structure of the steel and create a hazard.The thesis evaluates air cooling concepts relative to a barrel blank to assess its ability to handle heat flow and heat flux. The concepts have been designed in such a way that the ergonomic and practical weight limitations of a soldier have been taken into account. The results will provide a basis for future product development.The scientific work was limited to the section of the barrel nearest to the bore where the majority of the heat will be concentrated, hence that section with the biggest need for heat dissipation. For this to be done an assumption was made that the heat can only dissipate radially. The metal in this short section of the barrel is assumed to be heated equally along the barrel axis relative to the surrounding sections. The thesis was divided in two parts, a literature study and one with a deductive approach, where the research resulted in calculations in an iterative process.The calculations determined the cooling and heating time for each concept. Finally, the heat flow in and out was calculated.Based on the information that the calculations provided, a comparison could be done and an assessment for each concept to be a potential solution if it were to be applied in a sustained fire role. The conclusion was that an air cooled concept could never provide the heat flux needed to sufficiently cool a barrel in a sustained fire role due to all the thermal energy added for each shot fired.The composite concept that was evaluated has great potential in a lightweight weapon system. It provides quadruple cooling capability with no additional weight. It also has good potential for future development of the concept.

In recent years, lethal gang-related gun violence has increased in Sweden. The aim of this study is to investigate how young adults perceive and manage risks in society. Additionally, the study aims to investigate the media's influence on young adults' awareness of risks, with focus on the increased deadly gang-related gun violence. Since gang-shootings are a relatively new risk in Sweden, there is a lack of previous research on the subject and it is therefore relevant to research further, from a risk sociology perspective. Previous research therefore contains studies that investigate other social contexts than young adults in Sweden. The study's theoretical frame of reference is based on Gidden's (1996) theory of the consequences of modernity, Beck's (2000) theory of the risk society, Douglas' (2002) "subjective immunity" and Kaspersons et al. (1988) theory about social amplification of risk. This study uses qualitative interviews to investigate unique and in-depth stories from a limited number of individuals. The result shows that individuals do not seem to be afraid of being exposed to the risk themselves but are concerned that others may be exposed to it. The results display that expert knowledge from politicians is needed, however, young adults lack full confidence in politicians. The individuals in this study are overwhelmed by the information that the media spreads about the risk. Furthermore, the individuals perceive the risks as less dangerous than they appear in the media. Young adults also felt that gang-related gun violence affected them more if they were geographically close to the events. / Under de senaste åren har det dödliga gängkriminella skjutvapenvåldet ökat i Sverige. Syftet med studien är att undersöka hur unga vuxna uppfattar och hanterar risker i samhället. Syftet är även att undersöka hur media påverkar unga vuxnas medvetenhet om risker. Detta görs med fokus på ökningen av det dödliga gängkriminella skjutvapenvåldet. Eftersom gängkriminella skjutningar är en relativt ny risk i Sverige saknas det tidigare forskning om ämnet och är därför relevant att undersöka vidare utifrån ett risksociologiskt perspektiv. Tidigare forskning har därför byggts upp utifrån studier som undersöker andra sociala kontexter än unga vuxna i Sverige. Studiens teoretiska referensram utgår från Giddens (1996) teori om modernitetens följder, Becks (2000) teori om risksamhället, Douglas (2002) begrepp “subjektiv immunitet” och Kaspersons et al. (1988) teori om social förstärkning av risker. Denna studie använder kvalitativa intervjuer för att undersöka unika och djupgående berättelser från ett mindre antal individer. Resultatet visar att individer inte verkar vara rädda för att själva bli utsatta för risken, men känner en oro över att andra kan utsättas för den. Resultatet visar på att expertkunskaper från politiker behövs, men att unga vuxna saknar fullt förtroende för politiker. Individerna i denna studie känner sig överväldigade av informationen som media sprider gällande risken. Detta verkar leda till en viss avtrubbning och får individerna att uppfatta risken som mindre än den framstår i media. På liknande sätt hanterar individer detta, genom att skapa distans till situationen. De unga vuxna upplevde även att gängskjutningar påverkade dem mer vid geografisk närhet till händelser.

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Purpose This study amied to explore how police officers perceived the crime prevention efforts taken against gun violence in Sweden. Of particularly interest was to examine how certain efforts were perceived by the police officers, to be more or less effective when it comes to prevent gun violence from occurring among criminal networks. In this study, I explored which perceived effect certain efforts included under the working methods of community policing and problem-oriented policing had, as well as other efforts undertaken by law enforcement. Method Police officers who either worked in Gothenburg or Malmö city were targeted by the study. In sum, I received responses from 99 participants, in an on-line based questionnaire. The participants were selected through convenience sampling. Descriptive statistics are offered, and bivariate analyses were employed to identify officers’ perception differences of policing efficacy in vulnerable areas compared to non-vulnerable areas, and efficacy of law enforcement. Results The analyzes in the study, showed that the police officers overall perceived that the method of community policing to be crime preventive. This was especially the case for the vulnerable areas and in relation to the effort of an increased local police presence. As for the other method, problem-oriented policing, the officers particularly perceived that the effort of secret data eavesdropping to have the strongest crime prevention effect in both areas. The effort was also perceived to have more of an effect then both efforts included under community policing. As for hot spot policing, the other effort included under problem-oriented policing, the effort was overall perceived to have less of an effect among the officers. This was the cases for both areas. As for the importance to particularly prevent criminal networks possessions and sales of illegal drugs and weapons, community policing and problem-oriented policing were not perceived to be effective enough. As for the effect of the efforts undertaken by the law enforcement, a tougher approach against crime was among the police officers perceived to have the most effect. Conclusion The results of the study show that there is a continued increased need for evaluations of crime prevention efforts. The study also showed that there is an increased need that we as researchers, needs to further collaborate with the police force in order to further develop the craft of policing. / <p>2022-09-16</p>

<p dir="ltr">Additive manufacturing (AM) of gun propellants is an emerging and promising field which addresses the limitations of conventional manufacturing techniques. Overall, this thesis is a body of work which serves to bridge the gap between fundamental research and application of additively manufactured gun propellants.</p>

Doctor of Philosophy / Department of Sociology, Anthropology, and Social Work / W. Richard Goe / This study examined three of the prominent theories of juvenile delinquency to determine principle juvenile firearm carrying behaviors. The theories investigated were Differential Association/Social Learning, Social Control, and Anomie/Strain. The data set used for this research was the “National Survey of Weapons-Related Experiences, Behaviors, and Concerns of High School Youth in the United States, 1996” from the Inter-University Consortium for Political and Social Research at the University of Michigan. This national-level survey of youth was conducted by Joseph F. Sheley and James D. Wright to assemble detailed behavioral and attitudinal data concerning weapons and violence, and was completed by 733 10th and 11th grade male high school students. Comparison logistic regression model analyses were utilized to examine the study’s hypotheses. Findings indicated that juvenile firearms carrying is most influenced by delinquent peers, delinquent friends, and gang membership within the theoretical framework of Differential Association/Social Learning. Social Control Theory has the least explanatory power, while the analysis of Anomie/Strain suggests that vicarious strains (those strains experienced by people close to the juvenile) have even more influence on juvenile firearms carrying than experienced strain. Theoretical integration is recommended for future research attempting to provide greater explanatory and predictive power for serious forms of delinquency like juvenile firearms carrying.

Title: Basic Firearms Training for The Police of the Czech Republic Objectives: The objective of the thesis is to elaborate on basic firearms and shooting technique training within the scope of the basic training course of the Police of the Czech Republic. Methods: The fundamental methods used in the thesis are the data collection method, applied not only for studying literature, but also in the subsequent selection of professional experience and knowledge. Another method is the analysis method, used for expert evaluation. Another basic scientific method is applied, for the purpose of describing basic methodological and tactical procedures and also creating a set of preparatory training sessions. The method is referred to as information synthesis. Results: The output of the thesis is creating a complex view of the issue concerning firearms training for the Police of the Czech Republic according to today's methodology, tasks and objectives laid on this education course. Despite the curriculum of the firearms training being the same for several years, there is a definite improvement and effort to draw the training closer to actual situations and operations. I find that developing methodological guides and professional publications, not only from police shooting, but also practical and defense...

Title: Basic Firearms Training for The Police of the Czech Republic Objectives: The objective of the thesis is to elaborate on basic firearms and shooting technique training within the scope of the basic training course of the Police of the Czech Republic. Methods: The fundamental methods used in the thesis are the data collection method, applied not only for studying literature, but also in the subsequent selection of professional experience and knowledge. Another method is the analysis method, used for expert evaluation, verification, the quantitative, material, as well as interpretative and comparative analysis. Another basic scientific method is applied, for the purpose of describing basic methodological and tactical procedures and also creating a set of preparatory training sessions. The method is referred to as information synthesis. Results: The output of the thesis is creating a complex view of the issue concerning firearms training for the Police of the Czech Republic according to today's methodology, tasks and objectives laid on this education course. Despite the curriculum of the firearms training being the same for several years, there is a definite improvement and effort to draw the training closer to actual situations and operations. I find that developing methodological guides and...