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1
Baumgarten, Peter B. "Optimization of United States Marine Corps Officer Career Path Selection". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA381837.
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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 2000.Thesis advisor, Siriphong Lawphongpanich. "September 200." Includes bibliographical references (p. 67). Also available online.
2
Winters, Katherine Elaine. "Career Goals and Actions of Early Career Engineering Graduates". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26550.
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Much of engineering education research focuses on improving undergraduate engineering education. However, in order to help new engineers prepare for and successfully transition to the workplace, and therefore improve retention within the engineering practice, it is vitally important to understand the experiences of these early career engineers. The purpose of this study is to identify and explain the career goals and actions of early career engineering graduates. To accomplish this goal, this research addressed the question â What factors influence early career engineering graduatesâ career goals near the end of their undergraduate engineering studies, career-related actions taken in the subsequent four years, and their future career plans?â
Data were predominantly qualitative. Thirty participants were interviewed and surveyed near the end of their undergraduate studies, then completed pre-questionnaires and an interview as early career engineering graduates. Participants were graduates from three different universities and were diverse with respect to sex, race, and undergraduate major. Data analysis was framed by Social Cognitive Career Theory, as developed by Lent, Brown, and Hackett, and followed case study methods.
Results show that early career engineering graduates had diverse goals and interests, but similar influencing factors. They generally wanted to find appealing work and acted towards that goal. Relationships with faculty and expectations of positive outcomes heavily influenced participantsâ decisions to pursue graduate degrees, and family commitments geographically constrained career choices while also increasing the desire for stability. The economic downturn impacted job availability for most participants, but many participants were able to broaden their career searches to find interesting and fulfilling work. Participants that exhibited an ability to adapt to changing conditions reported the greater levels of satisfaction with their careers.
The findings of this research provide important information to engineering educators and employers as they mentor the next generation of engineers, and early career engineering graduates themselves as they seek to achieve their goals.Ph. D.
3
Odendaal, Marius. "Re-engineering an engineering career / Marius Odendaal". Thesis, North-West University, 2009. http://hdl.handle.net/10394/4755.
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Re-engineering is an ongoing process of change that continues throughout a
person's life. It includes all aspects of life, even your career and lifestyle as
you continue to grow as an individual. There is no satisfaction or of self-fulfilment
in clinging to a career and its accompanying lifestyle which you have
outgrown. To change this, people should approach career planning and
management from a different point of view. The making of a career and
lifestyle change is something most people find horrendously difficult. Making
effective career and lifestyle changes incorporating your dream and passion
should be seen as a challenge.
There is a common denominator in this whole discussion which influences the
decisions that people make when it comes to choosing their careers. It boils
down to wanting to make a success of their lives and the fear of being a
failure. But how does one define success? Success can mean different
things to different people. For some, monetary reward is a measure of
success. Yet others have multiple definitions of success. People should first
determine their own definition of success before deciding what career they
would like to pursue. Many of us make this decision based on what other
people, such as our parents or friends, perceive as success.
Exploring career choices should be a positive undertaking for high school
students. A thoughtfully constructed career choice process will provide a
meaningful, productive and satisfying framework for making quality career
choices. Some students do not begin to explore real career possibilities until
after graduation. Tertiary education institutions should provide students with
relevant information earlier in their studies. Institutions could be more proactive,
giving students information that they could test and use in their daily
studies and ultimately apply to their choice of career.
Young adults turn to their career guidance counsellors in their schools for
advice on determining what career paths they should follow. The problem
within the South African public educational system currently is that there is
inadequate provision for career guidance or assessment of individual learners.
The majority of young people leave school with only a vague knowledge of
employment opportunities and with little insight concerning the career
direction most appropriate to their abilities, interests and personality.
Believing that their only chance of future employment is the attainment of
some sort of qualification, they are pitch-forked into tertiary education without
any consideration given to the appropriateness of their chosen qualification to
their abilities, interests and personality. This results in a large percentage of
employees who feel trapped in an inappropriate career. This leads to low
morale, disinterest and de-motivation, translating into poor performance and
bad service levels. In the end unhappy employees either leave of their own
free will or need to be dismissed. In either case, the cost to the business is
substantial.
When it comes to making a career change in order to follow your dream and
passion, people are normally shackled by the comfort and security they
experience in their current jobs and the fear of failing should they risk
following their dream. The decision to make a career change should follow a
formal process in order to enable a person to make an informed and
responsible career change.
The value to the researcher personally is that he will have a better
understanding of why he decided to change his career. Is it a real choice or is
it only a pipe dream that will eventually fade away because of the challenges
facing him in the future?Thesis (M.Ing. (Development and Management Engineering))--North-West University, Potchefstroom Campus, 2010.
4
Garza, Raul P. "United States Marine Corps career designation board: significant factors in predicting selection". Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41381.
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Approved for public release; distribution is unlimited.The United State Marine Corps (USMC) re-implemented the competitive Career Designation (CD) board starting in FY 2010 to select and retain the most competitive junior officers. From 2010 to 2013, 4,723 out of 6,732 officers were offered CD. Utilizing a Probit model and the dataset of the 6,732 officers, we provide statistical analysis of what factors impact the officer's likelihood of being CD in each of the competitive subcategories of: combat arms, combat service support, aviation-ground, law, and aviation. We find that Reviewing Officer Relative Value Average is the most significant factor for most of the officers, as it increases the marginal probability of being CD by an average of 60 percentage points. Surprisingly, combat deployments were not consistently significant throughout the competitive categories. Finally, we develop an Excel-based interactive CD counseling tool, which provides the probability of the officer being CD, given the officer's individual characteristics.
5
Reamy, Stephen. "Optimal Career Progression of Ground Combat Arms Officers in the Marine Reserve". Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/6859.
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The purpose of this thesis is to examine career progression for ground combat arms officers in the Marine Corps Reserve, and to identify gaps between current and optimal career progression. Recent policy changes provide the catalyst for this thesis. On 4 December 2006, the Marine Corps announced the implementation of the Officer Candidate Course-Reserve. At the time, active component manpower practices and historically high retention rates resulted in reduced numbers of officers leaving active duty following their initial service obligation. Those officers who transitioned into the Reserve Component did so at grades more senior than required to fill junior officer billets. These factors combined to create a gap between RC junior company grade leadership requirements and the inventory of junior company grade officers. As the Marine Corps begins to staff reserve ground combat arms and engineer platoon and company commanders at 100% of manning, the requirement exists to develop a career path that provides the breadth of experience and expertise desired in its future leaders. However, challenges arise regarding the early to mid-stages of career progression due to training opportunities and PME requirements being less readily available to reserve officers than to their active component counterparts.
6
Yang, Y.-S. "Marine hazard assessment". Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356793.
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Mosaad, Mohamed Ahmed Abdel-Rahman. "Marine propeller roughness penalties". Thesis, University of Newcastle Upon Tyne, 1986. http://hdl.handle.net/10443/1006.
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The main objective of the project is to investigate the influence of surface roughness of marine propeller blades on propulsive power. The work has involved studies in the concept and practice of surface roughness measurement and characterisation as well as application of boundary layer theory for the analysis propeller-ship hull flow interaction of propeller flow and propellar-ship hull flow interaction. From extensive measurements of the surface topography of in-service propellers, a standard measurement procedure using different commercially available propeller-surveying instruments is described. A development of turbulent boundary layer procedures has been made to determine sufficiently accurately the increment of drag coefficient of propeller blade sections due to propeller blade surface roughness. The roughness function used for this integral boundary layer analysis is derived using, principally, Musker's experimental data. In addition, an experimental determination of the roughness function of a replicated propeller surface using a rotor apparatus has been carried out and described in detail. The turbulent boundary layer procedures require a knowledge of the surface variation of pressure over the propeller blade. For this purpose a program based on Riegels method has been used to give the velocity distribution for a given propeller section geometry. This is used with the boundary layer procedures for developing a complete program "PROFNESS" to calculate the increment of drag coefficient of the blade section. Results from different propellers analysed indicate that the power penalty is proportional to the relative blade roughness to the 1/3 power. An investigation has been made to compare the increment of frictional coefficient for a flat plate and propeller section profiles. It is shown that a "rough" flat plane calculation is quite adequate for such work.' The use of a flat plate analogue as a reference to calculate the skin friction resistance of both propeller and hull surfaces is considered. It is shown that the proposed solution of flat plate momentum integral equations provides a valid, simple and practical solution to the problem of predicting the hull and propeller roughness drag penalties. It also provides, particularly for ship hull resistance, a strong support for the ITTC Correlation Line, not only, and importantly, in regard to its slope, but also its level. For shipowners and operators who may not wish to access advanced computer programs, a simplified method has been proposed to calculate the propeller roughness penalties. There is a good agreement between the two simplified and detailed propeller analysis methods. The propeller roughness penalties, which can be obtained from either the simplified or the more rigorous method, can be related to the Rubert Propeller Comparator Gauges in order to quantify the benefits and justify the cost of the blade surface roughness. Analytical procedures have been included which can be used to calculate the combined effects on ship performance of propeller blade and ship hull surface roughnesses.
8
Robbins, Kent A. "Optimizing the U.S. Marine Corps' Selective Reenlisted Bonus program for the career force retention". Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FRobbins.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 2007.Thesis Advisor(s): Wood, R. Kevin. "September 2007." Description based on title screen as viewed on October 23, 2007. Includes bibliographical references (p. 21-22). Also available in print.
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Boisvert, Raymond J., i John C. Sumner. "Retention in the Marine Corps : the importance of quality in the career enlisted force". Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/27554.
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Approved for public release; distribution unlimited.This study examines the quality of enlisted marines at their first term reenlistment point. Of particular interest is to identify if a significant difference exists between the quality of the marines that are retained and the quality of those who depart. The analysis differs from previous studies, in that, performance-based indicators--proficiency and conduct marks, awards, and educational improvement--are use to measure quality. Also of importance is the development of a system that can be implemented by Headquarters Marine Corps to assist in identifying quality individuals. This system would incorporate performance-based criteria to recognize qualitative factors. The analysis uses data from fiscal 1982 through 1985 and combines different files available from Marine Corps sources. Results from the analysis indicate that there may be a loss of personnel quality at the reenlistment point. It was concluded that the Marine Corps could benefit by targeting quality individuals for reenlistment before they reach their expiration of active service.
10
Boisvert, Raymond J. Sumner John C. "Retention in the Marine Corps the importance of quality in the career enlisted force /". Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242093.
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Thesis (M.S. in Science in Management)--Naval Postgraduate School, December 1990.Thesis Advisor(s): Eitelberg, Mark J. ; Mehay, Stephen L. Second Reader: last name, first. "December 1990." Description based on title screen as viewed on April 01, 2010. DTIC Descriptor(s): Military forces (United States), measurement, Marine Corps, reenlistment, careers, quality, personnel, Marine Corps personnel, sources, enlisted personnel DTIC Identifier(s): Marine Corps personnel, reenlistment, quality, enlisted personnel, careers, demography, statistical analysis, theses. Author(s) subject terms: Quality at the reenlistment point for first-term marines. Includes bibliographical references (p. 115-117). Also available in print.
11
Wu, Wusheng. "Interaction between two marine risers". Thesis, University of Glasgow, 2003. http://theses.gla.ac.uk/4009/.
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This thesis takes top tensioned vertical riser interaction as its main study object. It has its focus on the understanding of the mechanism about potential instability of the risers caused by the interaction and the prediction of potential collision. Started from two-dimensional cylinder interaction cases, and later extended into the three-dimensional riser scenarios, the problem is investigated comprehensively. The study covers fluid force prediction, stability analysis, continuation investigation and dynamics simulation. The study disclosed the mechanism of the potential collision when the flow velocity reaches a certain critical value, and provides a robust tool to predict the threshold for the riser collision. Additionally, the investigation shows the difference between marine riser interaction and the similar interaction occurs in other engineering disciplines, such as power transmission lines, heat exchangers etc. Also provided in this thesis are valuable information regarding the riser dynamics should collision occur. The research will be beneficial to the marine riser designers and operators.
12
Keenan, David P. "Marine propellers in unsteady flow". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14348.
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Son, Kwangmin. "Physical ecology of marine microbes". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100148.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references.
Marine microbes play a fundamental role in driving ocean ecosystem dynamics and biogeochemistry. While their importance is global in scale, microbial processes unfold at the level of single cells and are intimately dependent on interactions between microorganisms, their neighbors, and the surrounding physical and chemical environment. Furthermore, traditional imaging techniques often provide frozen snapshots of the marine microbial world, yet microbial interactions are inherently dynamic, as for example in the case of motility, chemotaxis, and the encounter of microbes with viruses and animal hosts. These biological processes are frequently driven by physical mechanisms, and our understanding of them can benefit from a focus on the physical ecology of marine microbes. This is the approach pursued in this thesis, by directly applying dynamic imaging and microfluidics, which offer powerful new opportunities to study microbial processes in a time resolved manner and with exquisite environmental control. Through single-cell, live imaging of three fundamental marine microbial processes - motility, chemotaxis and viral adsorption - we demonstrate how capturing previously unseen biophysical processes in microbial ecology at their natural timescales can both shed light on unexplained mechanisms and provide robust quantifications of interaction rates. We first study a newly discovered nanoscale motility adaptation in the marine bacterium Vibrio alginolyticus using high-speed imaging. We found that marine bacteria can exploit a buckling instability of their flagellum to change direction during swimming, achieving the same functionality as multi-flagellated cells, but with the cost of synthesizing and operating only one flagellum. This finding not only reveals a new role of flexibility in prokaryotic flagella, but also highlights the exquisite motility adaptations of marine microbes to the resource-poor environment of the ocean. We then determine how this motility adaptation affects the cells' ability to climb chemical gradients ('chemotaxis'). We found that, counter- to current models, chemotaxis in V. alginolyticus is speed-dependent. Faster cells exhibited not only faster chemotactic migration, but also tighter accumulation around the resource peak. This result adds a new dimension to our understanding of bacterial chemotaxis pathways, by demonstrating that swimming speed can be an important and counter-intuitive control parameter in how marine microbes encounter and exploit chemical resources. Finally, we consider an encounter process that is motility-independent - that between a nonmotile host and a virus. Using the globally abundant marine cyanobacterium Prochlorococcus and a cyanobacterial virus ('cyanophage') as a model system, we directly imaged the encounter and adsorption dynamics of the virus and the host at the level of single cells, using dual-wavelength epifluorescent microscopy. By applying this non-invasive approach to quantify thousands of encounter events using automated image acquisition and analysis, we directly measured the rate at which viruses encounter and adsorb to hosts. We found that the probability of adsorption is considerably lower than was obtained with traditional, bulk measurement approaches, suggesting the need for a revision of viral infection dynamics in marine ecosystem models and opening the door for studies of microbial individuality in the context of viral infection. In summary, this thesis demonstrates that physical processes in microbial ecology, studied by means of new approaches including microfluidics and dynamic imaging at the single-cell scale, can contribute fundamental new insights into the ecology of marine microbes.
by Kwangmin Son.
Ph. D.
14
Ergun, Levent. "An analysis of officer accession programs and the career development of U.S. Marine Corps Officers". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FErgun.pdf.
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Park, Jin-Soo. "Marine traffic engineering in Korean coastal waters". Thesis, University of Plymouth, 1994. http://hdl.handle.net/10026.1/2410.
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This study describes and discusses the marine casualties, the effectiveness of existing traffic services, and marine safety and Vessel Traffic Service(VTS) in Korean coastal waters. Marine traffic is comprehensively assessed in Korean waters, an analysis of casualties is undertaken by block scheme. Marine environmental parameters are identified relating to marine casualties as appropriate. Various statistical techniques are employed to evaluate the inter-relationships between individual causal factors, and for the first time effect level is instituted to quantify the relative importance of the causal factors in Korean waters. A further innovation is the examination of the adequacy of existing Korean traffic services by casualty and traffic analysis, and an accident danger index is introduced to compare accident danger over different .time periods. A mixed population of contributors to marine safety is sought by questionnaire. The design of this is both innovative and original in content in order to evaluate the perceived importance of the various risk factors, the marginal effectiveness of various options in reducing risks, and their weight with regard to YTS services and activities, the main part of the study uses an original multiple coefficient to estimate casualty reduction rate and a new method to quantify the effectiveness of VTS. The Korean waters traffic study is conducted as an intermediate level and provides the data base for the main body of work. The conclusions include recommendations with respect to the stricter enforcement of the routeing scheme(TSS) and the adoption of further traffic observation/surveillance over the areas concerned. Finally it is noted in particular that additional Vessel Traffic Service and Traffic Separation Schemes are now required if any substantial improvement is to be achieved in marine traffic safety in Korean coastal waters.
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Kahkeshan, Siavoche. "Marine log supply : a transport engineering analysis". Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27117.
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This thesis investigates the marine transport-inventory system of Coastal British Columbia.
The intrinsic characteristics of marine log transportation in this region are the vulnerability of marine transportation to adverse weather conditions and the presence of time-related economic costs.
The system is confined to the Powell River operation. Three origins, one storage area and three pulp log types are considered. The formulated problem is classified as a sequential decision-making process. A deterministic model using the network flow theory and a simulation model using GPSS are developed. Due to considerable uncertainty in the system operation, the computer simulation model is selected.
The model includes all of the important system variables and their interactions and assesses alternative operational doctrines by calculating variation in a key aspect of system performance, total logistic cost.
It is found that: 1) the use of barges as the transportation mode leads to the least logistic cost, 2) the second best transportation alternative is the direct shipment of logs from origins to the mill and 3) if higher value saw log is considered, the log-taxi alternative may become attractive.
However, to improve the capability of the developed model, more information on the salt contamination and teredo damage and accurate estimation of cost consequences of a mill shutdown are required. Future works should focus on these areas.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
17
Calvert, Gregory L. "International education : career paths in science and engineering /". Full text available, 2006. http://adt.curtin.edu.au/theses/available/adt-WCU20070326.122816.
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Calvert, Gregory. "International education: career paths in science and engineering". Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/706.
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This study examines the relationship between international fee-paying students and career pathways through courses of study in Science and Engineering. International education is a significant endeavour in Australia in terms of any measure (students, dollars, associated employment). Over the last two decades it has grown in scope, beyond international fee-paying students, so that it now crosses all sectors of education and training (schools, vocational education and training, and higher education). Australian institutions have expanded their enrolment offshore and engaged in a variety of joint venture activities to capitalise on this surge of interest. The study examined international fee-paying students and career pathways shortly after the Organisation of Economic Co-operation and Development (OECD) conducted two major studies in 2004 into career education and transnational education amongst member countries. The links between course and career intentions were investigated by focusing on the subject fields of Science and Engineering. The term career pathway is used as a metaphor to describe the way students move through the Australian education and training system, with such movements possibly occurring through sequential levels or by sectors. A literature review was conducted initially, and a mixed research methodology (involving both quantitative and qualitative approaches) was adopted for the study. A survey instrument was used with a sample of 110 international fee-paying students drawn from students studying Science and/or Engineering at nine institutions across sectors of Australian education and training, then a further sample of 22 students was interviewed in order to gain an understanding of the underlying reasons for students making the decisions, in relation to courses and careers that they do.These samples provide the opportunity to evaluate international students' understandings of the Australian education and training system, especially the entry procedures into Science and/or Engineering courses. As part of the methodology the preliminary results were shared with the institutions involved to gain their input. Major findings were that 68 percent of the sample did not have career preparation or advice before coming to Australia; 52 percent of the sample was able to explain the term 'credit-transfer'; 53 percent of the sample had researched the recognition of their course in their home country, and careers advice was sought by 58 percent of the sample whilst studying in Australia. Resulting from the study are a number of recommendations for major stakeholders associated with international education (Australian Educational International, the Graduate Careers Council of Australia, government policy makers, institutions, the related professional bodies in the fields of Science and Engineering, and international fee-paying students). The findings of this study have implications for the way in which careers services are provided to international fee-paying students at Australian institutions. The outcome of this study is presented in two volumes. Volume One contains the body of the thesis in 6 Chapters. Volume Two (on disk) includes the associated documents of this study, presented in twelve Appendices.
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Calvert, Gregory. "International education: career paths in science and engineering". Curtin University of Technology, Science and Mathematics Education Centre, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16927.
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This study examines the relationship between international fee-paying students and career pathways through courses of study in Science and Engineering. International education is a significant endeavour in Australia in terms of any measure (students, dollars, associated employment). Over the last two decades it has grown in scope, beyond international fee-paying students, so that it now crosses all sectors of education and training (schools, vocational education and training, and higher education). Australian institutions have expanded their enrolment offshore and engaged in a variety of joint venture activities to capitalise on this surge of interest. The study examined international fee-paying students and career pathways shortly after the Organisation of Economic Co-operation and Development (OECD) conducted two major studies in 2004 into career education and transnational education amongst member countries. The links between course and career intentions were investigated by focusing on the subject fields of Science and Engineering. The term career pathway is used as a metaphor to describe the way students move through the Australian education and training system, with such movements possibly occurring through sequential levels or by sectors. A literature review was conducted initially, and a mixed research methodology (involving both quantitative and qualitative approaches) was adopted for the study. A survey instrument was used with a sample of 110 international fee-paying students drawn from students studying Science and/or Engineering at nine institutions across sectors of Australian education and training, then a further sample of 22 students was interviewed in order to gain an understanding of the underlying reasons for students making the decisions, in relation to courses and careers that they do.These samples provide the opportunity to evaluate international students' understandings of the Australian education and training system, especially the entry procedures into Science and/or Engineering courses. As part of the methodology the preliminary results were shared with the institutions involved to gain their input. Major findings were that 68 percent of the sample did not have career preparation or advice before coming to Australia; 52 percent of the sample was able to explain the term 'credit-transfer'; 53 percent of the sample had researched the recognition of their course in their home country, and careers advice was sought by 58 percent of the sample whilst studying in Australia. Resulting from the study are a number of recommendations for major stakeholders associated with international education (Australian Educational International, the Graduate Careers Council of Australia, government policy makers, institutions, the related professional bodies in the fields of Science and Engineering, and international fee-paying students). The findings of this study have implications for the way in which careers services are provided to international fee-paying students at Australian institutions. The outcome of this study is presented in two volumes. Volume One contains the body of the thesis in 6 Chapters. Volume Two (on disk) includes the associated documents of this study, presented in twelve Appendices.
20
Morris, Joe H. "An analysis of personnel career development practices within the United States Marine Corps contingency contracting force". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FMorris.pdf.
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Thesis (M.S. in Management)--Naval Postgraduate School, December 2002.Thesis advisor(s): Marshall Engelbeck, David V. Lamm. Includes bibliographical references (p. 129-135). Also available online.
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Newhouse-Maiden, Lesley Patricia. "Hearing their voices : building a career development model for women in engineering". Thesis, Curtin University, 2002. http://hdl.handle.net/20.500.11937/2474.
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This study is an interpretive investigation of the life-career histories of 53 women in engineering; and a case study of one woman's account of present-lived career and her quest for identity in engineering over an eight year period (1992-1999). This study had two broad aims. First, it aimed to give voice to women's stories derived from their own reflective accounts, and to compare and contrast their perspectives with feminist writers' reviews of non-traditional girls' and women's career experiences, and with the organisational career story of itself. Second, it aimed to evaluate the adequacy of my convergence of a socialist feminist "unified systems" theory of social relations (Jaggar, 1983, 1989; Jaggar & Rothenberg, 1984, 1993) with Super's segmental life-span, lifespace theory (Super, 1980, 1990, 1994) to explain women's career and personality development. Further to this theoretical convergence, I elaborated on Super's original models and evaluated their usefulness for my gender analysis of career from four perspectives. I conceptualised "career" as both "subjective" and "organisational" (Dale, 1972; Hughes, 1937) and, using Benhabib's (1986b) terminology, created four perspectives by further differentiating career into either "generalised other" or "concrete other" (see Figure 1.1). Drawing on the findings of my exploration of the women's careers, I extended the range of Jaggar's/Super's explanatory theories of career and personality development (Figure 2.2) in an elaboration of Supers archway model (Figure 8.1). I found that my combined Jaggar/Super career archway and spider web model (Figure 2.3) represented the life-space tensions in each individual woman's career decision-making in engineering.The life-career rainbow was a valuable subsidiary model (Figure 2.4) in highlighting the complexities of gender as an overarching socio-cultural factor for theoretical and conceptual analyses of career and its effect on salient role relationships and personality development at each life-stage. My convergence career ladder represented the organisational career statuses and the successive development of the subjective career and identity through the completion of developmental tasks (Figure 2.6). My case study Cecilia, in common with other participants, I found to be an accomplished "feminine ambivalent" (Douvan & Adelson, 1966) and "paver of the way" (Josselson, 1987), yet she (like several others) floundered in the milieux of engineering. Her story indicates the continued need for engineering educators: to acknowledge the significance of women's subjective constructs of career to effect transformative change by promoting equity and excellence; to recognise ways in which the subjective and the organisational constructs of career can complement one another; and to implement changes which facilitate such complementarity. This study fills a space in the research literature on non-traditional girls' and women's career development. It also has potential to assist those who wish to gain a better understanding of the career pathways of women in engineering.
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Desing, Renee. "The Impact of Counterfactual Thinking on the Career Motivation of Early Career Women Engineers: A Q Methodology Study". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594915284572443.
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Cunningham, Andrew Donald. "Monte Carlo simulation in the marine environment". Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6001/.
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Duerr, Phillip S. "Investigation of marine waterjet inlets during turning maneuvers". Thesis, Florida Atlantic University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10095898.
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Numerical simulations of waterjet inlets have been conducted in order to understand inlet performance during ship turning maneuvers. During turning maneuvers waterjet systems may experience low efficiency, cavitation, vibration, and noise. This study found that during turns less energy arrived at the waterjet pump relative to operating straight ahead, and that the flow field at the entrance of the waterjet pump exhibited a region of both low pressure and low axial velocity. The primary reason for the change in pump inflow uniformity is due to a streamwise vortex. In oblique inflow the hull boundary layer separates when entering the inlet and wraps up forming the streamwise vortex. These changes in pump inflow during turning maneuvers will result in increased unsteady loading of the pump rotor and early onset of pump rotor cavitation.
Simulations covered drift angles from 0° to 30°, pump velocities relative to free stream speed of 0.6 to 1.0 for inlet geometries with ramp angles of 25° and 30° with inlet-hull fairing radii relative to pump diameter of 0.1 to 0.2. The following observations were made: 1) the onset of the streamwise vortex occurred between drift angles of 5° and 10°; 2) increasing drift angle increased the strength of the streamwise vortex and lowered the energy of the flow entering the pump; 3) increasing the flow rate through the waterjet system increased the strength of the streamwise vortex; 4) increasing ramp angle tended to increase the strength of the streamwise vortex; and 5) increasing the fillet radius decreases the strength of the streamwise vortex.
Simulations of steady ahead operation of the waterjet propelled R.V. Athena were also conducted for Froude numbers of 0.34 to 0.84. From these simulations it was found that the pump inflow can be effectively approximated at a new ship speed from a known ship speed by scaling only the mean component of the axial velocity by the relative change in waterjet flow rate. Additionally, waterjet pump operating point and rotor blade inflow angles were found to independent of ship speed.
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Levesque, Christopher R. (Chirstopher Robert) 1965. "Vibration suppression in finite length marine cable systems". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47678.
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Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.Includes bibliographical references (p. 49).
The vibration suppression effectiveness of a flexible in-line marine cable vibration absorber is studied. The transfer matrix method is used to build various numerical models of vibration absorbers in marine cable systems. The models determine cable system natural frequencies, mode shapes and modal damping ratios. The introduction of absorber damping is shown to result in complex roots to the modal characteristic equations. A computer complex root solver is used to solve for the complex roots of the characteristic equations, resulting in complex system natural frequencies. The significance of complex natural frequencies is explained. Complex natural frequencies are used to calculate modal damping ratios. The models demonstrate that absorber effectiveness is heavily dependent on absorber location, absorber mass and absorber length. Parametric variation is used to achieve maximum effectiveness of the flexible in-line absorber. Even under optimum conditions, it is shown that the absorber provides insufficient damping to reduce vortexinduced vibrations in water. The same transfer matrix method is used to evaluate the effectiveness of a massspring- dashpot type absorber in a marine cable system. This type of absorber is shown to produce adequate damping to reduce vortex-induced vibrations in water. The transfer matrix method used in this thesis is validated by analyzing the same system using an approach by Den Hartog [1]. The transfer matrix approach combined with complex root solving capability is shown to provide an effective analysis method for marine cable systems.
by Christopher R. Levesque.
M.S.
Nav.E.
26
Craig, Robert George. "Promoting a career in engineering : an investigation of factors influencing career decision-making in New Zealand". Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/2313.
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This thesis reports on survey research, conducted on a sample of Year 12 students within New Zealand who attended school in the Greater Auckland region during Autumn 2009. The survey gathered data in order to assess the students’ knowledge, attitudes, and the perceived influences on those attitudes, towards engineering as a career or field of study. The purpose of the research was to better understand factors that may influence Year 12 New Zealanders’ career decisions, especially with respect to careers in engineering, with a view to recommending to stakeholders how enrolment into Bachelor of Engineering programs might be increased.Schools were selected using stratified random sampling, and their Principals were approached through a strategy of emails, telephone calls, and by local personal contact. The students were surveyed via an online questionnaire, administered by school teachers and/or careers personnel, and conducted within school hours. A total of 292 students from 9 schools within the Greater Auckland region took part, and a variety of statistical techniques was used to analyze their responses.The New Zealand students were assessed as having a good knowledge of the benefits and demands of a career in engineering, and a positive attitude towards many of the suggested traits of engineering careers. Contradictions were found between the students’ perceived influences on their career choices, and the patterns of their response choices to a number of the survey questions. Statistically significant relationships were also found between the gender and ethnic background of the survey sample, the students’ attitudes towards careers in general and towards careers specifically in engineering, the influences on those attitudes, and the students’ selection of engineering as a career or field of study.Conclusions were drawn based on the research findings, and recommendations made as to how enrolment into Bachelor of Engineering programs might be increased. The recommendations formulated are directed to practitioners within the engineering profession and also to advisors within the education sector. Recommendations for additional research are then made.
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Abujaafar, Khalifa Mohamed. "Quantitative human reliability assessment in marine engineering operations". Thesis, Liverpool John Moores University, 2012. http://researchonline.ljmu.ac.uk/6115/.
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Marine engineering operations rely substantially on high degrees of automation and supervisory control. This brings new opportunities as well as the threat of erroneous human actions, which account for 80-90% of marine incidents and accidents. In this respect, shipping environments are extremely vulnerable. As a result, decision makers and stakeholders have zero tolerance for accidents and environmental damage, and require high transparency on safety issues. The aim of this research is to develop a novel quantitative Human Reliability Assessment (HRA) methodology using the Cognitive Reliability and Error Analysis Method (CREAM) in the maritime industry. This work will facilitate risk assessment of human action and its applications in marine engineering operations. The CREAM model demonstrates the dynamic impact of a context on human performance reliability through Contextual Control Model controlling modes (COCOM-CMs). CREAM human action analysis can be carried out through the core functionality of a method, a classification scheme and a cognitive model. However, CREAM has exposed certain practical limitations in its applications especially in the maritime industry, including the large interval presentation of Human Failure Probability (HFP) values and the lack of organisational factors in its classification scheme. All of these limitations stimulate the development of advanced techniques in CREAM as well as illustrate the significant gap between industrial needs and academic research. To address the above need, four phases of research study are proposed. In the first phase, the adequacy of organisation, one of the key Common Performance Conditions (CPCs) in CREAM, is expanded by identifying the associated Performance Influencing Factors (PIFs) and sub-PIFs in a Bayesian Network (BN) for realising the rational quantification of its assessment. In the second phase, the uncertainty treatment methods' BN, Fuzzy Rule Base (FRB) , Fuzzy Set (FS) theory are used to develop new models and techniques' that enable users to quantify HFP and facilitate the identification of possible initiating events or root causes of erroneous human action in marine engineering operations. In the third phase, the uncertainty treatment method's Evidential Reasoning (ER) is used in correlation with the second phase's developed new models and techniques to produce the solutions to conducting quantitative HRA in conditions in which data is unavailable, incomplete or ill-defined. In the fourth phase, the CREAM's prospective assessment and retrospective analysis models are integrated by using the established Multiple Criteria Decision Making (MCDM) method based on, the combination of Analytical Hierarchical Process (AHP), entropy analysis and Technique for Order Preference by Similarity to the Ideal Solution (TOPSIS). These enable Decision Makers (DMs) to select the best developed Risk Control Option (RCO) in reducing HFP values. The developed methodology addresses human actions in marine engineering operations with the significant potential of reducing HFP, promoting safety culture and facilitating the current Safety Management System (SMS) and maritime regulative frameworks. Consequently, the resilience of marine engineering operations can be further strengthened and appreciated by industrial stakeholders through addressing the requirements of more safety management attention at all levels. Finally, several real case studies are investigated to show end users tangible benefits of the developed models, such as the reduction of the HFPs and optimisation of risk control resources, while validating the algorithms, models, and methods developed in this thesis.
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Whitcher, Alan. "Situation awareness of marine control room operators". Thesis, Southampton Solent University, 2013. http://ssudl.solent.ac.uk/3002/.
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Jastram, Michael Oliver. "Inspection and feature extraction of marine propellers". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/42632.
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Castellanos, Samantha Nicole. "Casting a one-lunger Atlantic marine engine". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105712.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (page 39).
Fabrication of a one-lunger Atlantic marine engine for the purposes of developing a curriculum for an advanced fabricating and machining class for the Papplardo Apprentices at MIT. One-lunger marine engines greatly influenced the fishing cultures of Nova Scotia at the turn of the 20th century. Discussion of proper casting practices and terminology in addition to theory of sand types, machinability, engine cycles, and ignition systems. In depth descriptions of basic and advanced casting processes using the ignitor body and piston as examples.
by Samantha Nicole Castellanos.
S.B.
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Hadjistassou, Constantinos Kyprou. "International maritime organization : rethinking marine environmental policy". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33579.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005.Includes bibliographical references (leaves 67-70).
As environmentalism has swept into political prominence, influencing the environmental policy of developed nations, the IMO- the UN dedicated legislator of the shipping industry- has been increasingly faced with challenges to its decision making process as well as to the effective fulfillment of its role. The current treatment of environmental matters, especially when it comes to negotiations for enacting universally accepted and implemented regulations seems to be in need for reconsideration. This is mainly the case because, the systematic adoption of unilateral/regional measures, at best, can undermine the status of the IMO and, at worst, may prove disruptive to international shipping. The purpose of this thesis is to put concerns over the role of the IMO in international environmental regulations negotiations into a specific context and attempt to view the organization's treatment of the issues it is faced with from a perspective which will reveal the strengths and the shortcomings of the IMO, so that credible remedies could be suggested. In order to achieve this goal, three case studies were used namely the Member States, the Interest Group, and the Industry case study.
(cont.) These cases- selected to identify areas of improvement for the 1MO- have demonstrated that the agency's working procedures merit reassessment if the agency is to remain the industry's legislator. A close examination of the conclusions extracted from the three case studies reveals that the MO is faced with the challenge of leveraging multiple types of initiatives which can emanate from powerful maritime nations, coalition/regional groups, interest groups, stakeholders, and the public.Consequently, if it is to serve its purpose effectively and efficiently, the IMO ought to develop the institutional mechanisms that will encourage policy innovations in the realm of international environmental negotiations whilst strengthening the agency's status as the industry's legislator. Similarly, in view of its evolving role, the agency has to act proactively so as to strike a balance between environmentally sound and sustainable shipping. The closing chapter of the thesis indicates that judging the present and the future of the [MO should be done in the light of excessive pessimism, since some initiatives already underway may improve the current situation, but there is still a lot of room for improvement.
by Constantinos Kyprou Hadjistassou.
S.M.
32
Ventouras, Laure-Anne. "Iron and the ecology of marine microbes". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/80257.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biological Engineering, 2013Cataloged from PDF version of thesis.
Includes bibliographical references.
Iron is a cofactor of a number biochemical reactions that are essential for life. In the marine environment, this micronutrient is a scarce resource that limits processes of global importance such as photosynthesis and nitrogen fixation. Given that marine microorganisms play a central role in modulating such biogeochemical cycles, understanding how their distribution, diversity and activity may be affected by changes in iron availability is key. This thesis explores how the availability of iron affects the ecology of marine microbial populations and communities. At the population level, I characterized the prevalence and diversity of iron acquisition strategies in specific populations of marine vibrios with distinct micro-habitat preferences. Using a combination of genomics and functional screens, I showed that siderophore-based iron acquisition is not conserved at the organismlevel but represents a stable trait at the population level. This population-level trait further appears to play a role in driving the diversification of specific vibrio populations, especially of those that are thought to prefer particles as a micro-habitat. At the community level, I measured whole microbial community responses to iron addition in microcosm experiments in different regions of the Pacific Ocean. Using metagenomics, I characterized the impact of iron availability on the microbial community structure of the Central Equatorial Pacific Ocean. This study showed that addition of iron to an iron-limited ecosystem triggers a phytoplankton bloom dominated by Pseudo-nitZschia-like diatoms, which in turn stimulate a Bacteroidetes population functionally distinct from the ambient free-living population. In the North Pacific Subtropical Gyre, I explored how iron availability impacts microbial community gene expression dynamics. Using a metatranscriptomic approach I showed that in that environment, the impact of iron was tightly connected to the supply of other limiting macronutrients, and seems to mostly affect photosynthetic organisms. This initial study paves the way for more in depth and longer-term studies to further investigate the effects of iron on the dynamics of the microbial community in the North Pacific Subtropical Gyre. Taken together data and analyses presented in this thesis demonstrate how iron availability can shape the ecology of marine microorganisms at population, community and functional levels.
by Laure-Anne Ventouras.
Ph.D.
33
Rossouw, T. J. "The underwater separation of diamantiferous marine gravels". Master's thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/8312.
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Includes bibliography.Three underwater separation devices have been designed, constructed, tested and analysed to determine their suitability for the underwater separation of diamantiferous marine gravels. The research facility where the devices were tested was constructed at the University of Cape Town's Hydrotransport Research facility. The first device tested was a converging elutriator which separates the oversize gravel from the smaller diamond-bearing gravel, using their varying particle settling velocities in an upward flowing fluid. The cyclosieve and spirosieve are two other choices that both use rotational flow to create a centrifugal force, which forces the gravel onto a screening surface. The test work carried out investigated the effect of various variable parameters on the separation efficiency of each device.
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Bejarano, Heredia Alberto Ismael. "Determinants of career success for engineering technology program graduates". Doctoral thesis, Universitat Ramon Llull, 2009. http://hdl.handle.net/10803/9201.
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L'èxit de la carrera és un resultat important de la trajectòria personal que sovint s'ignora. Totes les empreses i les organitzacions actuals operen en un món canviant, amb crisis globals en el sector energètic, financer i de les tecnologies emergents. Aquestes organitzacions necessiten disposar d'enginyers amb èxit per tal de desenvolupar els avantatges competitius que sustentin el seu desenvolupament futur. La finalitat primera d'aquest estudi ha estat explicar l'èxit en la carrera dels enginyers. Sobre la base de la literatura acadèmica (entre d'altres, Arthur et al., 2005; Heslin, 2005; Gunz, 2005; Baruch, 2006), s'ha elaborat un model de determinants d'èxit de la carrera que considera la perspectiva objectiva i subjectiva d'aquest constructe i s'ha desenvolupat l'evidència empírica de l'èxit en la carrera d'aquesta categoria de treballador del coneixement a l'Amèrica Llatina.
Les preguntes de recerca s'han centrat a verificar la relació entre l'èxit en la carrera dels enginyers i els graduats de programes amb orientació pràctica, i la xarxa personal de contactes, la competència individual per a l'administració, l'experiència professional, l'estructura organitzativa i les aspiracions individuals. Les dades s'han obtingut d'una enquesta a 1.135 graduats, que van respondre 1.011, cosa que representa un índex de resposta de 89,7 %, i d'arxius complementaris de l'escola d'enginyeria Tecsup.
Els resultats suggereixen que l'èxit en la carrera sovint és determinat, primer, per l'estructura de la carrera a les organitzacions; en un segon nivell, per la xarxa personal i, en un tercer nivell, per l'experiència professional i les aspiracions individuals.
Es fan suggeriments per a futures investigacions i s'esmenten les implicacions que poden tenir per als investigadors, els gerents de recursos humans i les organitzacions educatives.
El éxito de carrera es un importante pero frecuentemente ignorado resultado de la carrera personal. Todas las compañías y organizaciones operan en este mundo cambiante, con crisis globales en el sector energético, financiero y tecnologías emergentes. Estas organizaciones necesitan ingenieros más exitosos para el desarrollo de ventajas competitivas que sustente su desarrollo futuro.
El propósito primario de este estudio fue explicar el éxito de carrera de los ingenieros. Construido sobre las bases de la literatura académica (entre otros, Arthur et al (2005); Heslin (2005); Gunz (2005); Baruch (2006) )un modelo de determinantes de éxito de carrera fue estudiado que considera la perspectiva objetiva y subjetiva de este constructo, desarrollo la evidencia empírica del éxito de carrera de esta categoría de trabajador del conocimiento en latino America.
Las preguntas de investigación estuvieron centradas en verificar la relación entre el éxito de carrera de ingenieros, graduados de programas con orientación practica, y la red personal de contactos, la competencia individual para la administración, la experiencia Professional, la estructura organizacional y las aspiraciones individuales. Los data fueron obtenidos de un encuestar a 1135 graduados,; 1011 respondieron, representando un tasa de respuesta de 89.7 % y archivos complementarios de la escuela de ingeniería Tecsup.
Los resultados sugieren que el éxito de carrera esta fuertemente determinada por la estructura de carrera en las organizaciones. En segundo nivel, el éxito de carrera es determinado por la red personal y en un tercer nivel por la experiencia Professional y las aspiraciones individuales.
Sugerencias para futuras investigaciones e implicaciones para investigadores, gerentes
de recursos humanos y organizaciones educativas son provistas.
Career Success is an important but often overlooked outcome of a person's career experiences. All businesses and organizations operate in a changing World, with global energy crisis and emerging technologies. These organizations need more successful engineers for the development of competitive advantages that sustain his future development.
The primary purpose of this study was to explain engineer's career success. Building upon academic literature (e.g, Arthur et al (2005); Heslin(2005); Gunz (2005); Baruch (2006) ) a model of determinants of career success was studied; both objective and subjective perspectives were used, developing empirical evidence for career success of this category of knowledge workers in Latin America.
Research questions were focused on the relationship between technologists' career success and their personal network, individual competences, professional experience, organizational structures, and individual aspirations. Data were gathered from a survey of 1135 graduates of engineering technology programs; 1011 responded, for a response rate of 89.7 % and archives of Engineering School.
The results suggest that career success of technologist are strongly determined by organizational structures and individual competences. In second level, career success s determined by personal network and in third level the professional experience, and individual aspirations.
Suggestions for future research and implications for practitioners, researchers and educative organizations are provided.
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Gelles, Laura A. "Career Prospects and Resources of Domestic Engineering Doctoral Students". DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7650.
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Career prospects are a motivating factor for entry and retention of doctoral students, especially in the discipline of engineering. While doctoral student training provides them with highly specialized skills to be an independent researcher, they may not have the requisite skills or guidance to secure the job position of their choice. Therefore, it is important to provide doctoral students with opportunities, training, and information (i.e., resources) about different types of careers to not only ensure they are productive contributors of teaching and research, but also equip them for future career prospects. Research techniques based upon in-depth narrative interviews and combining research with action were used to explain how doctoral students develop and fit in with their intended careers and was used to explore what supports and challenges contribute to their intended career paths. Analysis of the data revealed three themes: (1) Engineering Doctoral Identity; (2) Engineering Doctoral Skill Development; and (3) Time. Research emerged as central to engineering doctoral identity and was reinforced by ‘Insiders’, or people who had a Ph.D. in engineering. Insiders’ and doctoral students’ value of research came at the cost of relatively devaluing other skills (e.g., teaching) and associated career resources. These students had to consider and compromise how they fit within an engineering doctoral identity that is premised on research. This negotiation influenced the skills they developed and how they crafted tactics to acquire necessary skills for future careers. At the same time, participants were struggling to cope with immediate demands of their study while also working towards future career goals. Participants struggled to optimize their time, and in response utilized “Time Adaptive Tactics” such as flexibility, networking, and leveraging career resources. Engineering doctoral student and university staff perceptions of career resources were compared against each other which revealed that students utilize resources based upon a hierarchy that considers how specific and close in time and location those resources are. Whereas staff believed their resources were beneficial regardless of these factors. Additionally, the career resources that participants used were influenced by Insiders and how they implicitly showed they valued those resources.
36
Pinto, Waldir Terra. "On the dynamics of low tension marine cables". Thesis, University College London (University of London), 1995. http://discovery.ucl.ac.uk/1317622/.
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This thesis is concerned with the dynamics of low tension marine cables. These cables are widely used in the ocean environment for signal and power transmission applications. There are two main issues in the dynamic analysis of such cables. When the tension is zero, which is often the situation encountered at the seabed during cable laying, the cable geometric stiffness matrix becomes singular. The other issue is that the transformation from local co-ordinates to global co-ordinates made through Euler angles leads to a greater number of unknowns than the number of differential equations. The former problem can be overcome by taking into account the flexural rigidity of the cable. The latter problem can be overcome by assuming that one of the Euler angles is known. However, this procedure can introduce singularities on the formulation of the problem. A new three dimensional model for the dynamics of marine cables is presented in this thesis. The model takes into account the bending stiffness of the cable in order to overcome singularities in the geometric stiffness matrix. In order to overcome the problem owing to the use of Euler angles, a new displacement approach is introduced. This new displacement approach uses the differential geometry definition of curvature and torsion in order to establish the transformation from the local co-ordinates to the global co-ordinates. The general formulation of the dynamics of marine cables presented in this thesis is applicable to a wide range of cases such as towed cables, cable installation and cable recovery. In order to illustrate this new formulation the cases of towed cables and cable installation are investigated in the some detail. Solutions for the differential equations of motion are presented for two and three dimensions. The two dimensional solution is obtained through a finite element based technique which uses a weak Galerkin formulation for integration in space and the Newmark method for integration in time. The model's results are compared with full scale measurements. Simulations of the dynamic response of marine cables to vessel wave induced motions and vessel changes in speed are also presented. The three dimensional solution is obtained by expressing the equations of motion as functions of the Euler angles. The space integration is also performed by a finite element model but it uses a finite difference scheme for the time integration. This solution is then used to study the influence of sheared cross-currents in the cable's configuration. Finally, conclusions and suggestions for further research are presented.
37
Hamm, James J. "Different success rates and associated factors at three levels of career progression among US Marine Corps officers". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA275220.
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Ma, Yong Feng. "Characterization of Macau marine deposits". Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1943027.
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Leavitt, Joseph William. "Intent-aware collision avoidance for autonomous marine vehicles". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/111893.
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Thesis: Nav. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 259-278).
Applications of autonomous marine vehicles in dynamic and uncertain environments continuously grow as research unveils new enabling technology and academic, commercial, and government entities pursue new marine autonomy concepts. The safe operation of these vehicles in the marine domain, which is currently dominated by human-operated vehicles, demands compliance with collision avoidance protocol, namely the International Regulations for Preventing Collisions at Sea (COLREGS). Strict application of this protocol can lead to a highly constrained motion planning problem, in which it is difficult for a vehicle to identify a safe and efficient motion plan. This thesis proposes a multi-objective optimization-based method for COLREGS-compliant autonomous surface vehicle collision avoidance in which vehicles use shared intent information, in addition to vehicle state information, to identify safe and efficient collision avoidance maneuvers. The proposed method uses intent information to relax certain COLREGS-specified constraints with the goal of providing sufficient maneuvering flexibility to enable improvements in safety and efficiency over a non-intent-aware system. In order to arrive at an intent-aware solution, this thesis explores the concept of intent, including intent formulations for the marine domain, intent communications, and the application of intent to the COLREGS-compliant motion planning problem. Two types of intent information are specifically evaluated: COLREGS mode intent, in which the give-way vessel in an overtaking or crossing scenario communicates its intent to maneuver in a certain direction with respect the stand-on vessel, and discrete trajectory intent in which vehicles communicate projected future positions. Simulations and on-water experiments demonstrate the feasibility of the proposed intent-aware method, as well as improvements in performance, in terms of both vehicle safety and mission efficiency, over a non-intent-aware, COLREGS-compliant collision avoidance method.
by Joseph William Leavitt.
Nav. E.
S.M.
40
Leavitt, Joseph William. "Intent-aware collision avoidance for autonomous marine vehicles". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111893.
Pełny tekst źródłaStreszczenie:
Thesis: Nav. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 259-278).
Applications of autonomous marine vehicles in dynamic and uncertain environments continuously grow as research unveils new enabling technology and academic, commercial, and government entities pursue new marine autonomy concepts. The safe operation of these vehicles in the marine domain, which is currently dominated by human-operated vehicles, demands compliance with collision avoidance protocol, namely the International Regulations for Preventing Collisions at Sea (COLREGS). Strict application of this protocol can lead to a highly constrained motion planning problem, in which it is difficult for a vehicle to identify a safe and efficient motion plan. This thesis proposes a multi-objective optimization-based method for COLREGS-compliant autonomous surface vehicle collision avoidance in which vehicles use shared intent information, in addition to vehicle state information, to identify safe and efficient collision avoidance maneuvers. The proposed method uses intent information to relax certain COLREGS-specified constraints with the goal of providing sufficient maneuvering flexibility to enable improvements in safety and efficiency over a non-intent-aware system. In order to arrive at an intent-aware solution, this thesis explores the concept of intent, including intent formulations for the marine domain, intent communications, and the application of intent to the COLREGS-compliant motion planning problem. Two types of intent information are specifically evaluated: COLREGS mode intent, in which the give-way vessel in an overtaking or crossing scenario communicates its intent to maneuver in a certain direction with respect the stand-on vessel, and discrete trajectory intent in which vehicles communicate projected future positions. Simulations and on-water experiments demonstrate the feasibility of the proposed intent-aware method, as well as improvements in performance, in terms of both vehicle safety and mission efficiency, over a non-intent-aware, COLREGS-compliant collision avoidance method.
by Joseph William Leavitt.
Nav. E.
S.M.
41
Pullen, Roger. "Poly(itaconate) esters as marine antifoulants". Thesis, Southampton Solent University, 1998. http://ssudl.solent.ac.uk/2436/.
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A series of fluorinated and non-fluorinated poly(mono- and diitoaconate)s and a perfluorinated acrylate, poly(2-(N-ethylperfluorooctanesulfanamido)ethyl acrylate) have been synthesised, by both solution and bulk chain growth polymerisation methods, characterised and some of their properties (thermal behaviour, surface energy and marine antifouling peformance) have been investigated. Chemical structures were confirmed by Gourier-transform infrared (FTIR) and nuclear magnetic resonance (1H & 13C NMR) spectroscopies, as well as mass spectrometry. Poly(itaconate)s prepared by solution chain growth polymerisation resulted in low average relative molecular mass (Mw <15000), whereas those prepared by bulk chain-growth polymerisation were of high average molecular mass (Mw ca 60000). The thermal degradation behaviour of polu(monoitaconate)s, Mwca60000, was dominated by dehydration/de-esterification reaction at ca 170 deg.C which yielded a poly(anhydride) structure. Poly(diitaconate)s Mwca 60000, were thermally stable up to ca 285 deg.C above which a chain-unzipping process resulted in the formation of monomer as the major degradation product. Glass transition temperatures (Tg) were not observed for poly(monotaconate)s; for poly(hexanoyl diitaconate) Tg was ca -18 deg.C whereas poly(1H,1H,2H,2H-perfluorodecanoyl diitaconate) exhibited two glass transition temperatures, attributed respectively to the relaxation of the alkyl side chain (ca 5 deg.C) and the overall polymer transition (ca 35 deg.C). Poly(hexadecanoyl diitaconate) was the only dditaconate to exhibit a melting endotherm. Surface energy contributions were calculated using the surface tension component (Good-Girafalco-Fowkes) theory. Recently-advanced and recently-receded contact angle measurements were performed at 25.0 + or - 0.2 deg.C for drops of water, diiodomethane and ethylene glycol on the itaconates that could be formed into films. Both recently-advanced and recently-retarded contact angles demonstrated the time-dependency of the wetting behaviour for drops of water, attributed to the slow, stepwise absorption of water by the polymer. Contact angles for drops of diiodomethane and ethylene glycol remained constant over time. Poly(1H,1H,2H,2H-perfluorodecanoyl diitaconate), PI-2, possessed the most hydrophobic surface (initial recently-advanced water contact angle: ca 120 degrees), whereas the least hydrophobic material was poly(hexadecanoyl diitaconate), PH-2; initial recently-advanced contact angle: ca 96 deg. Poly(1H,1H,2H,2H-perfluorodecanoyl diitaconate), PI-2, exhibited the lowest surface energy (advanced ca 7 mJm-2; receded: mean 9.7 mJm-2), whereas poly(hexadecanoyl diitaconate), PH-2 had the highest (advanced: ca 31-37 mJ m-2; receded 39.7 mJm-2). Poly(dodecanoyl monoitaconate), PA-5/6 exhibited surface energies of ca 22 mJ m-2 (advanced) and ca 31 mJ m-2 (receded). The low surface energy of poly(1H,1H,2H,2H-perfluorodecanoyl diitaconate), PI-2 is attributed to both the high hydrophobicity of the surface and the presence of pendent fluorocarbon side chains, which prevent the interaction of diiodomethane molecules with the polymer backbone. The relatively high surface energy of poly(hecadecanoyl diitaconate), PI-2, is due to the lower contact angles measured for this material. Increases in the basic contribution over time and its larger value relative to corresponding acidic contributions are attributed to the uptake of water by the polymer; hydrogen bonding with oxygen atoms of the ester linking group may provide the driving force behind the observed phenomenon. Antifouling performances were evaluated in seawater exposure trials over two fouling seasons. The sequence of fouling events was similar in both seasons: initial settlement by barnacles and algae follwed by settlement of tunicates. In the 1995 exposure trial polymers prepared by solution chain-growth polymerisation as well as a selection of commercial materials were evaluated. All samples exhibited almost no resistance to marine fouling. Suggested contributory factors to their poor performance was their low average relative molecular mass (Mw <15000), a variability of sample coatings or the ineffectiveness of the samples against the inhibition/prevention of settlement/attachment by marine fouling organisms. In the 1996 trial, high average molecular mass poly(itaconate) films prepared by bulk chain-growth polymerisation reactions were exposed. Poly(dodecanoyl monoitaconate)(PA-6), poly(1H,1H,2H,2H-perfluorodecanoyl monoitaconate) (PE-6) and poly(hexadecanoyl diitaconate) (PH-2) exhibited slight resistance to marine fouling, with resistances for these materials after seven months of exposure, of 13%, 18% and 34% respectively (control surfaces had fouling resistances of -5%). Areas free from coverage by fouling organisms were observed on all samples. The overall low resistance of poly(itaconate) can most likely be attributed to the absorption of water by these polymer films.
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Pina, Kyle (Kyle Richard). "Career path analysis of professionals selected by MIT undergraduates". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119943.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.Cataloged from PDF version of thesis.
For current MIT undergrads, life after graduation can seem daunting. With uncertainty about job duration, graduate school, and career paths in general, many undergraduates enter the real world unsure of what the future holds, or if what they have decided to do post-graduation is the "best" option. As such, MIT undergraduates in the Undergraduate Practice Opportunities Program (UPOP) were asked to interview professionals that they believed had jobs they would one day also like to have. This resulted in a large dataset of career paths for an extremely diverse group of individuals, all with their own unique stories and time-lines. This data was filtered, cleaned, and analyzed to gain insight into life after graduation. From the analyzed data it was found that the distributions of durations spent at graduate school, in companies, or in specific job titles were all not significantly different, and the average duration spent in each of these options was 2-6 years, with some noticeable outliers. Overall these analyses showed that there are many options for students in the first 10 years after completing their BS, and there is no clear "correct" option to choose from.
by Kyle Pina.
S.B.
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Hummel, Robert A. (Robert Andrew). "Infrastructure for large-scale tests in marine autonomy". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70436.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 141-147).
This thesis focuses on the development of infrastructure for research with large-scale autonomous marine vehicle fleets and the design of sampling trajectories for compressive sensing (CS). The newly developed infrastructure includes a bare-bones acoustic modem and two types of low-cost and scalable vehicles. One vehicle is a holonomic raft designed for station-keeping and precise maneuvering, and the other is a streamlined kayak for traveling longer distances. The acoustic modem, like the vehicles, is inexpensive and scalable, providing the capability of a large-scale, low-cost underwater acoustic network. With these vehicles and modems we utilize compressive sensing, a recently developed framework for sampling sparse signals that offers dramatic reductions in the number of samples required for high fidelity reconstruction of a field. Our novel CS sampling techniques introduce engineering constraints including movement and measurement costs to better apply CS to sampling with mobile agents. The vehicles and modems, along with compressive sensing, strengthen the movement towards large scale autonomy in the ocean environment.
by Robert Andrew Hummel.
S.M.
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Agosto, Priscilla (Priscilla M. ). "Fabrication of an 1897 Herreshoff marine steam engine". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112564.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 46-47).
A 19th century Herreshoff marine steam engine was developed using a combination of traditional and modern fabrication methods. Background on Nathaniel Herreshoff, his connection to MIT and the Herreshoff Manufacturing Company was provided. The process for selection of appropriate steam engine with the input from the Francis Russell Hart Nautical Museum at MIT was explored. CAD models were developed from the original drawings from MIT's Haffenreffer-Herreshoff Collection. Pattern making options, casting, sand types and machining practices were explored and analyzed. Furthermore, a blueprint for a single-semester course in advanced fabrication methods for MIT 2.007 Senior Undergraduate Apprentices was proposed.
by Priscilla Agosto.
S.B.
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Calder, Jon P. (Jon Patrick) 1955. "Application of freight identification technologies to marine transportation". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9552.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1999.Includes bibliographical references (p. 113-115).
This study was carried out to investigate the use of freight identification technology for marine container tracking. This research was also intended to evaluate the different forms of the technology and enlighten ocean carriers on the strengths and weaknesses of each technology. The various currently available products and the technologies they represent are identified along with their technical characteristics. Three metrics are identified to assist in evaluating the technologies for this application. These are: Level of Service, Cost, and Institutional or Legal factors. The technologies are evaluated in relationship to these metrics and several implementation strategies are suggested. Included are descriptions of some of the technical background and features of the technologies.
by Jon P. Calder.
S.M.
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Andrews, Gordon Moseley P. "Modeling and fabrication of an Atlantic marine engine". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112566.
Pełny tekst źródłaStreszczenie:
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (page 44).
Three-dimensional CAD models for the one-lunger Atlantic marine engine cylinder and manifold were developed from original engineering drawings, and the corresponding patterns and core molds for casting designed. The viability of CNC milled high-density foam for fabricating complex casting patterns and molds was demonstrated with the Atlantic engine cylinder and manifold. The modeling processes presented in this paper can be applied to other projects in documenting historical components and machinery, and the CNC fabrication techniques can be applied generally for rapid pattern and mold generation. From a historical perspective, the development of the models, patterns and physical castings presented in this paper are one step in restoring the heritage of the one-lunger marine engines and bringing life to the first Atlantic engine of the 2 1st century.
by Gordon Moseley P. Andrews.
S.B.
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Qi, Yusheng Ph D. Massachusetts Institute of Technology. "Sea surface wave reconstruction from marine radar images". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74939.
Pełny tekst źródłaStreszczenie:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 103-105).
The X-band marine radar is one type of remote sensing technology which is being increasingly used to measure sea surface waves nowadays. In this thesis, how to reconstruct sea surface wave elevation maps from X-band marine radar images and do wave field prediction over short term in real time are discussed. The key idea of reconstruction is using dispersion relation based on the linear wave theory to separate the wave-related signal from non-wave signal in radar images. The reconstruction process involves three-dimensional Fourier analysis and some radar imaging mechanism. In this thesis, an improved shadowing simulation model combined with wave field simulation models for the study of the correction function in the reconstruction process and an improved wave scale estimation model using non-coherent radar data are proposed, which are of great importance in the reconstruction process. A radar image calibration method based on wave field simulation is put forward in order to improve the quality of reconstructed sea surface wave. Besides, a theoretical wave scale estimation model using Doppler spectra of the coherent radar is put forward, which is proposed to be a good alternative to the current wave scale estimation model. The reconstructed sea surface wave can be used for wave field simulation in order to predict the wave field, which is not only an application of this reconstruction process, but also a parameter optimizing tool for the reconstruction process.
by Yusheng Qi.
S.M.
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Cortes, Romero Juan Jose. "Reliability based design of marine risers". Thesis, University of Newcastle Upon Tyne, 1999. http://hdl.handle.net/10443/774.
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The harsh environment in which offshore structures must operate, their intended service life and the uncertainties inherent to the load processes, have been the impulse for investigation of their reliability. The method most extensively applied for this purpose during the last two decades was the Structural Systems Reliability, which can not be coupled with the finite element method. Therefore the objectives of the present work are to investigate the applicability of a technique which allows the utilization of the reliability analysis methods with a marine riser modelled by the finite element method, FEM, and revision of the reliability levels associated with this riser, including the fatigue life. For these purposes the response surface methodology was selected, among a number of methods. A response surface approach which requires a low number of experiments with the FEM model was elected, calculations for construction of the response surface are further simplified by the assumption of statistical independence among the basic variables. It is demonstrated in the present study that the response surface is capable of producing an equivalent and explicit limit state function which is used at a second stage with the First Order Reliability Method and the Adaptive Importance Sampling simulation technique. However, it was found that the assumption of independence is not always valid. In this case, a method is proposed in which the correlated variables are implicitly considered at the level of the mechanical model. The reliability of the marine riser was reviewed with the proposed algorithms, finding that the validity of the reliability levels depend on the number of basic variables considered and their statistical properties. The significant reduction in required computing time achieved with the response surface methodology allowed parametric studies to be carried out, in order to investigate the impact of different statistical properties of the basic variables. The fatigue reliability case was also investigated with the S-N approach. The introduction of uncertainty in the fatigue life estimation proved that acceptable levels of deterministic fatigue life may render unacceptablelevels of reliability. The uncertainty associated with the stress range is the most significant variable, though the present fatigue reliability formats consider it in a very simplified manner, therefore an approach is suggested with which the stress uncertainty can be considered in a more detailed fashion. However, the algorithm used here for construction of the response surface was unable to produce the required surface. Therefore it is concluded that though the response surface is capable of handling a large number of structural reliability cases, there are instances in which more research efforts are needed.
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Bates, C. R. "Seismic anisotropy as an indicator of marine sediment stability". Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236517.
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Gin, Karina Y. H. (Karina Yew Hoong). "Microbal size spectra from diverse marine ecosystems". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/40155.
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