A Comparison of Induction Motor Starting Methods Being Powered by a Diesel-Generator Set

Starting induction motors on isolated or weak systems is a highly dynamic process that can cause motor and load damage as well as electrical network fluctuations. Mechanical damage is associated with the high starting current drawn by a ramping induction motor. In order to compensate the load increase, the voltage of the electrical system decreases. Different starting methods can be applied to the electrical system to reduce these and other starting method issues. The purpose of this thesis is to build accurate and usable simulation models that can aid the designer in making the choice of an appropriate motor starting method. The specific case addressed is the situation where a diesel-generator set is used as the electrical supplied source to the induction motor. The most commonly used starting methods equivalent models are simulated and compared to each other. The main contributions of this thesis is that motor dynamic impedance is continuously calculated and fed back to the generator model to simulate the coupling of the electrical system. The comparative analysis given by the simulations has shown reasonably similar characteristics to other comparative studies. The diesel-generator and induction motor simulations have shown good results, and can adequately demonstrate the dynamics for testing and comparing the starting methods. Further work is suggested to refine the equivalent impedance presented in this thesis.

World of Unknown Creatures and Their Hidden Works

What is the most mysterious feelings in mankind? What is the most general way by which every mankind is subject to change. Well monotonous, and steady life where someone does the same kind of work at same pace in same time, without any change of events, creates the burdensome feeling in a person. Yet people are unaware of it. We don't know where are we going, yet we go at the same pace, since in practical sense we are getting some credit for something. But the thing how much do we keep up, and maintain the balance in nature, so that we can really feel the value and the quality of life, and know the exact happiness of fulfilling the work. But if its totally becomes materialistic, and emotional aspect goes away from human beings, where social talking never goes away from your duties. Then!!!! ... I mean there is no need of human beings. If we are so developed, right from past few centuries and our domination, had created a modern social world, then we can create all kinds of devices and software which can handle all the works for which the people don't have to stay overtime just to finish that. I mean in that way human life will move through some progress, and will have some development. But the environment where we are living nothing new or development is taking place as the work becomes a duty for human being but not to machine which should be given some task to be completed.So all those devices are not in the society, since human being is already taking charge if it.

Maxwell Arboretum Anniversary Celebration

What a pleasure it is to have this opportunity to welcome you to campus today as we celebrate the 35th anniversary of the Earl G. Maxwell Arboretum. Henry Van Dyke once wrote that "He that planteth a tree ... provideth a kindness for many generations, and faces that he hath not seen shall bless him."

The Nebraska State Grange

Thank you so much for inviting my wife Virginia and me to be with you today. It delights me to talk about land-grant universities in general, and about the land-grant university mission we take so very seriously in the Institute of Agriculture and Natural Resources in particular, because I am so proud of the way our faculty and staff continually strive to contribute to and improve the economic and societal well-being of rural Nebraska, as well as all of Nebraska.

Nebraska Lead XX Morning Meeting

Good morning. I am delighted to be with you here this morning to offer my congratulations and my best wishes as you complete the LEAD program. This is a wonderful and significant accomplishment, and I certainly hope you all are celebrating and savoring it. I look forward with enthusiasm to watching your future contributions as leaders in agriculture, in your local communities, in Nebraska, and in our global community. I'd like to start my remarks this morning with one question: How many people in this room have ridden an elephant? Show of hands?

Sorghum Research Meeting

It is my pleasure to welcome you to East Campus this morning, and I thank you for inviting me to be here with you. I am pleased that we have this opportunity to come together to exchange information and ideas, to update on what's happening now, and to look to the future. It is important that we make and take advantage of such opportunities to communicate with each other, to learn each others' views, and to work with each other toward our common goals. I want to personally thank the people who have worked to organize this meeting and to put this morning's agenda together.

Nebraska Turfgrass Conference

I’m delighted to be here with you, and look forward to visiting with as many of you as possible both today and in the future. I’ve just completed one year in my job as University of Nebraska Vice President of agriculture and natural resources and Harlan Vice Chancellor of the Institute of Agriculture and Natural Resources, and it has been a learning year for me. As I start this second year, I look forward to learning even more about Nebraska and its citizens, and one of the ways to best do this is to hear what you are thinking. I want to know what you consider Nebraska’s greatest needs, now and in the future. I want to know how you think the Institute of Agriculture and Natural Resources can help meet those needs. I seek ways all of us working together, can find efficient and effective solutions to Nebraska’s concerns, and I want to know your interests in our work – what you think we do well, what you think we could do better, what you think the needs of the future will be.

School of Natural Resource Sciences

Good afternoon. Thank you for asking me to be with you today; I welcome this opportunity to talk with you, to hear what you're thinking, and to participate with you in an exchange of ideas. I've been asked to make some prepared remarks this afternoon, and when those are ended I welcome your ideas, your questions, and your comments. I look forward to more discussions with you at other times, as well. I do have open hours Friday afternoons, and encourage faculty and staff to stop by to visit, to share an idea, to ask a question, or to just visit. Sometimes duties call me away, as they will for the next few Fridays, but I try to be available as many Friday afternoons as possible for drop-in visitors. I hope you'll be among them. As a big believer in the land grant university, with our mission of teaching, research, and extension education, I also am a big believer that it takes all of us, working together, to fulfill that mission.

Service Utilization Patterns of Homeless Youth

Few studies exist on the types of characteristics associated with service utilization (e.g., shelters, food programs) among homeless youth in the U.S. Services are important, however, because without food and shelter, numerous homeless youth resort to trading sex in order to meet their daily survival needs. Access to physical and mental health services gives homeless youth more of an opportunity to integrate into mainstream society than they would otherwise have. To address this gap in our understanding, my study examines what traits (e.g. age, race, abuse history) correlate with the use of shelters, food programs, street outreach, counseling, STD/STI testing, and HIV testing among homeless youth. The Theory of Reasoned Action is used as an ideological framework in conjunction with theoretical constructs of risk, need, and prior service exposure. Data were obtained from the Social Network and Homeless Youth Project (SNHYP), a sample of 249 Midwestern homeless youth ages 14 to 21, which used trained interviewers to conduct structured interviews with youth. Respondents were interviewed in both shelters and on the street over a period of approximately one year. My findings revealed that homeless youth’s service usage varied across gender, sexual orientation, age, having recently held a job, and having ever been physically or sexually abused, in addition to other characteristics. Conversely, service use was not associated with social network size or subjective norms (i.e. attitudes of peers, such as acceptance of condom use) of youths’ social networks. By examining these areas, my study builds on previous research on homeless youth and lays the framework for future research on service utilization by homeless youth.

A CURRENT EXAMINATION OF DIETARY INTAKES OF FIBER, CALCIUM, IRON, AND ZINC AND THEIR RELATIONSHIP TO BLOOD LEAD LEVELS IN U.S. CHILDREN AGED 1-5 YEARS

A CURRENT EXAMINATION OF DIETARY INTAKES OF FIBER, CALCIUM, IRON, AND ZINC AND THEIR RELATIONSHIP TO BLOOD LEAD LEVELS IN U.S. CHILDREN AGED 1-5 YEARS Stephanie Ann Melchert, M.S. University of Nebraska, 2010 Adviser: Kaye Stanek Krogstrand The effect of lead on the health and well-being of those exposed has been well documented and many efforts have been made to reduce exposure of lead to the United States population. Despite these efforts, many studies have documented cognitive impairments and behavioral problems in children with even low levels of lead in their blood. Previous studies have suggested that a proper diet may have a role in the prevention of elevated blood lead levels in children. The objective of this study was to determine if there was an inverse correlation of blood lead levels (BLL) in children to their dietary intakes of fiber, calcium, iron, and zinc considering low levels of lead exposure. This study examined 1019 children in the National Health and Nutrition Examination Survey (NHANES) conducted from 2005-2006. Data were analyzed using Spearman’s rank correlations to correlate continuous variables to BLL in children and independent samples t-tests were used to compare mean blood lead levels of categorical variables. Results indicate that BLL in children is significantly correlated with and weight, recumbent length/standing height, dietary fiber intake and continine, a marker of cigarette smoke exposure. BLL was not significantly correlated with calcium, iron, zinc, or vitamin C. A significant difference was found in the mean BLL of children who took supplements, lived in smoking homes, as well as those who lived in homes built before 1978. Overall, this study shows that children living in homes built before 1978 remain at greater risk for lead exposure, and adequate dietary fiber intake may provide benefits to children who are exposed to lead.

AÇÃO REGULATÓRIA DO GnRH NO DESENVOLVIMENTO EMBRIONÁRIO PRECOCE E VITRIFICAÇÃO DE EMBRIÕES SUÍNOS PELO MÉTODO DE MICROGOTA (ROLE OF GnRH DURING EARLY EMBRYONIC DEVELOPMENT AND DEVELOPMENT OF SWINE EMBRYOS FOLLOWING VITRIFICATION BY MICRODROPLET METHOD)

The objective of this study was to investigate the role of GnRH on the preimplantation development of mouse embryos in vitro. GnRH-I, GnRH-II, and GnRH agonists: Des-Gly, Des-Trp and histrelin did not improve embryo development. However, treatment with the specific GnRH antagonist SB-75 blocked embryo development at morula stage. The inhibition of embryo development by SB-75 could be rescued by the addition of histrelin. To determine which intracellular signaling cascade is involved following binding of GnRH to the GnRHR, embryos were cultured in the presence of specific PKC (GFX) or PKA (SQ22536) inhibitors. The PKC inhibitor blocked embryo development at a similar stage as SB-75, whereas SQ22536 had an inhibitory effect, diminishing blastocyst formation and hatched rates. There are evidences that GnRH has an essential autocrine effect on mouse embryonic development via GnRHR, probably by activating PKC signaling cascade while the inhibition of the GnRH signaling does not activate apoptotic mechanisms involving caspase-3. In another experiment, development in vitro of embryos from Chinese Meishan (M) and occidental white crossbred (WC) females were investigated after improving the vitrification protocol for pig embryos. Efficient cryopreservation of zona pellucida-intact porcine embryos and studies of the difference among breeds could greatly impact the swine industry. The percentage of embryos surviving 24 h after cryopreservation without lysis or degeneration was higher for M (72%) than WC (44%). However, in vitro development of embryos that survived cryopreservation was not different between M and WC at the expanded (64%) or hatched (22%) blastocyst stages. Developmental rates were significantly higher for control embryos than frozen embryos from both breeds at expanded blastocyst stage, but not at hatched blastocyst stage. Rates of expanded blastocyst formation did not differ between M and WC control embryos (98 and 95%, respectively). With a new procedure to warm vitrified pig embryos, the survival rates may be improved. The optimal stages to vitrify pig embryos using the microdroplet method ranges from late compact morula to early expanded blastocyst. The results suggest that M embryos have a higher capacity to survive the vitrification process than WC embryos. O objetivo do presente estudo foi investigar a importância do GnRH no desenvolvimento embrionário precoce em camundongos. GnRH-I, GnRH-II e os GnRH agonistas: Des-Gly, Des-Trp e histrelina não incrementaram o desenvolvimento embrionário. Entretanto, o tratamento com SB-75, um antagonista específico do GnRH, bloqueou o desenvolvimento embrionário no estádio de mórula. A inibição do desenvolvimento embrionário pelo SB-75 pôde ser revertida com a adição de histrelina. Para determinar a cascata do sinal intracelular desencadeada pela ligação do GnRH com o seu receptor, embriões foram cultivados na presença de inibidores específicos da PKC (GFX) e da PKA (SQ22536). O inibidor da PKC bloqueou o desenvolvimento embrionário em estádio similar ao bloqueio mediado pelo SB- 75, enquanto o SQ22536 teve efeito inibitório diminuindo a formação de blastocisto e taxas de eclosão. Os resultados sugerem que o GnRH tem um efeito autócrino essencial no desenvolvimento embrionário através do GnRHR, provavelmente, ativando a cascata da PKC. Por outro lado, a inibição do sinal do GnRH não ativa mecanismos apoptóticos que involvam caspase-3. Em outro experimento, foi investigado o desenvolvimento in vitro de embriões da raça Meishan (M) e branco cruzado (WC) após vitrificação pelo método microgota. O desenvolvimento de protocolos eficientes para criopreservação de embriões suínos com a zona pelúcida intacta e a avaliação das diferenças entre raças pode ter um significativo impacto na suinocultura. A percentagem de embriões que sobreviveram à criopreservação depois de 24 h foi maior na M (72%) do que na WC (44%). No entanto, o desenvolvimento in vitro dos embriões que sobreviveram à criopreservação não foi diferente entre M e WC nos estádios de blastocisto expandido (64%) ou eclodido (22%). Os índices de desenvolvimento foram significativamente mais altos para os embriões controle do que para os embriões vitrificados nas duas raças no estádio de blastocisto expandido, porém não foram diferentes para o estádio de blastocisto eclodido. A formação de blastocisto expandido não diferiu entre os embriões controle M e WC (98 e 95%, respectivamente). Com o novo procedimento (“hot warm”) para descongelar embriões vitrificados pelo método de microgota, pode-se aumentar dos índices de sobrevivência. Os melhores estádios embrionários para a vitrificação de embriões suínos variam de mórula compacta tardia até blastocisto expandido inicial. Os resultados sugerem que embriões M têm mais capacidade de sobreviver ao processo de vitrificação do que embriões WC.

The Critical Reception of Beethoven’s Compositions by His German Contemporaries, volume 2

The volumes in The Critical Reception of Beethoven's Compositions by His German Contemporaries bring to light contemporary perceptions of Beethoven's music, including matters such as audience, setting, facilities, orchestra, instruments, and performers as well as the relationship of Beethoven's music to theoretical and critical ideas of the eighteenth and nineteenth centuries. These documents, most of which appear in English for the first time, have been compiled from German-language periodicals published between 1783 and 1830. They present a wide spectrum of insights into the perceptions that Beethoven's contemporaries had of his monumental music. This is the second in a projected four-volume series. It begins with Opus 55, the Eroica, and ends with Opus 72, Fidelio.

Women in Wisdom Tradition: Review of Carol Fontaine, Smooth Words: Women, Proverbs and Performance in Biblical Wisdom

Smooth Words is a well-researched and entertaining, if somewhat uneven, book on women in the Wisdom tradition in ancient Israel. Fontaine, a faculty member at a small Protestant seminary in Newton, MA, writes with her students constantly in mind, her interactions with them informing her scholarship throughout the book. She is also in dialogue with other scholars in the fields of Wisdom literature and feminist scholarship, a dialogue that gives the book academic rigor and depth.

On Modular Design of Field Robotic Systems

Robots are needed to perform important field tasks such as hazardous material clean-up, nuclear site inspection, and space exploration. Unfortunately their use is not widespread due to their long development times and high costs. To make them practical, a modular design approach is proposed. Prefabricated modules are rapidly assembled to give a low-cost system for a specific task. This paper described the modular design problem for field robots and the application of a hierarchical selection process to solve this problem. Theoretical analysis and an example case study are presented. The theoretical analysis of the modular design problem revealed the large size of the search space. It showed the advantages of approaching the design on various levels. The hierarchical selection process applies physical rules to reduce the search space to a computationally feasible size and a genetic algorithm performs the final search in a greatly reduced space. This process is based on the observation that simple physically based rules can eliminate large sections of the design space to greatly simplify the search. The design process is applied to a duct inspection task. Five candidate robots were developed. Two of these robots are evaluated using detailed physical simulation. It is shown that the more obvious solution is not able to complete the task, while the non-obvious asymmetric design develop by the process is successful.

Effects of Systematic Social Skill Training on the Social-Communication Behaviors of Young Children with Autism During Play Activities

A systematic social skills training intervention to teach reciprocal sharing was designed and implemented with triads of preschool-age children, including one child with an autism spectrum disorder (ASD) and two untrained classroom peers who had no delays or disabilities. A multiple-baseline research design was used to evaluate effects of the social skills training intervention on social-communication and sharing behaviors exhibited by the participants with ASD during interactive play activities with peers. Social-communication behaviors measured included contact and distal gestures, touching peers and speaking. Four sharing behaviors were also measured, including sharing toys and objects, receiving toys and objects, asking others to share, and giving requested items. Results indicated considerable gains in overall social-communication behaviors. The greatest improvements were observed in the participants’ use of contact gestures and speaking. Slightly increasing trends were noted and suggested that participants with ASD made modest gains in learning the sharing skills taught during social skills training lessons. Social validity data indicate that participants with ASD and peer participants found the intervention appropriate and acceptable, and staff perception ratings indicated significant changes in the social skills of participants with ASD. Study outcomes have practical implications for educational practitioners related to enhancing social-communication and social interactions of young children with ASD. Study limitations and future directions for research are discussed.