204,045 research outputs found
Transanal Hartmann reversal: a new technique
No full textBackground: Hartmann procedure consists in a sigmoidectomy followed by a terminal colostomy. However, the stoma is associated with complications and suboptimal quality of life, so the restoration of colonic continuity should be, at least, considered in any case. Open restoration has been associated with significant morbidity and mortality; therefore, many authors have described the advantages of laparoscopic Hartmann reversal. We want to go a step further showing our experience using a combined laparoscopic and transanal approach in an attempt to improve the surgical technique. Methods: Patients with an end colostomy due to an emergency Hartmann procedure are selected for this intervention. This approach is performed simultaneously laparoscopically and transanally, with single-port devices, through the colostomy wound in the first case and trough anal canal in the second one. The previous stapler line is resected transanally and the proximal rectum and mesorectum are dissected until the peritoneal reflexion, where both teams work together to complete the adhesiolysis. Finally an end-to-end anastomosis is performed under laparoscopic control. Results: As in patients with rectal cancer, dissection of the stump in Hartmann reversal procedure may be better and associated with shorter operative time. Conclusions: As with any new surgical procedure, it is probably too early to draw conclusions, but nowadays transanal combined with laparoscopic approach seems to be a safe and feasible technique to perform a Hartmann reversal
Voices of Women
No full textThe media can be accessed here: http://streaming.osu.edu/KnowledgeBank/BuckeyeHistoryLive/Voices_of_Women.MP3This episode of Buckeye History Live combines excerpts from five oral histories with Ohio State University women from the Voices of Women project, a collaboration between The Women's Place and the University Archives. Deb Ballam, emeritus professor of business and former Director of The Women’s Place, talks about her involvement in activism as an undergraduate at Miami and then her advocacy for women’s and LGBT rights as a law student at OSU.
Rudine Sims Bishop, emeritus professor of education, discusses her identities as both a woman and an African-American and the impact those identities have had on the trajectory of her life and career. Shirley Dunlap Bowser, 1956 OSU grad and former member of the Board of Trustees, tells about her time as an undergraduate. Gay Hadley, former Assistant Vice President for Human Resources, talks about her experiences as a non-traditional student and a University administrator. Susan Hartmann, emeritus professor of history and women’s studies and former Director of the Center for Women’s Studies, discusses being a female professor at OSU.Audio: Welcome and Introductions (00:00:00-00:01:02); Interviewee - Dr. Deborah Ballam, Emeritus Professor of Business, The Ohio State University, Former Director of The Women's Place (00:01:03-00:20:13); Interviewee - Dr. Rudine Sims Bishop, Emeritus Professor of Education, The Ohio State University (00:20:14-00:27:32); Interviewee - Shirley Dunlap Bowser, Former Member of The Ohio State University Board of Trustees (00:27:33-00:44:44); Interviewee - Gay Hadley, Former Assistant Vice President for Human Resources, The Ohio State University (00:44:45-00:57:29); Interviewee - Susan Hartmann, Emeritus Professor of History and Women's Studies, The Ohio State University, Former Director of the Center for Women's Studies (00:57:30-01:14:49); Conclusion (01:14:50-01:15:12
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
An exploratory analysis of the personal community hypothesis as a determinant of camping participation
No full textTypescript (photocopy).Modeling outdoor recreation participation has been conducted since the early 1960s, with limited explanatory power of the models used. A review of the literature indicates that one promising area of research is the "Personal Community Hypothesis" as applied to recreation behavior. This hypothesis indicates that one's social surroundings influence his recreation participation decisions. Proposed components of this hypothesis are the elemental, socialization and co-participant dimensions of one's social influences. This dissertation explored potential aspects of the PCH which may influence participation in camping, especially the influence of one's co-participant group, using data from the Forest Service component of the Public Area Recreation Visitor Survey. Both choice of camping style and duration of the camping experience were examined. Results identify several aspects of one's personal community which influence camping behavior, including age and education of the individual and co-participant group members. However, the predictive power of the models developed was limited
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
From weak interaction to gravity
No full textWe follow an old suggestion made by Stueckelberg that there exists an intimate connection between weak interaction and gravity, symbolized by the relationship between the Fermi and Newton's constants. We analyze the hypothesis that the effect of matter upon the metric that represents gravitational interaction in general relativity is an effective one. This leads us to consider gravitation to be the result of the interaction of two neutral spinorial fields (g-neutrinos) ψg and ωg with all kinds of matter and energy. We present three examples with only one g-neutrino: two static and spherically symmetric configurations and a cosmological framework for an isotropic dynamical universe. Without self-interaction, the associated effective geometry is precisely the Schwarzschild metric. On the other hand, a self-interacting g-neutrino generates a new gravitational black hole
Gravitational waves in the spinor theory of gravity
No full textWe analyze the gravitational waves within the Spinor Theory of Gravity (STG) and compare it with the General Relativity proposal. In the case of STG, a gravitational wave may occur if the effective gravitational metric induced by the spinorial field is Ricci flat
Parahaplosyllis Hartmann-Schroder 1990
No full textGenus Parahaplosyllis Hartmann-Schröder, 1990 Parahaplosyllis Hartmann-Schröder 1990: 45. San Martín et al. 2010: 38–42, emended. Type species. Parahaplosyllis brevicirra Hartmann-Schröder, 1990.Published as part of Álvarez-Campos, Patricia, Martín, Guillermo San & Aguado, M. Teresa, 2013, A new species and new record of the commensal genus Alcyonosyllis Glasby & Watson, 2001 and a new species of Parahaplosyllis Hartmann-Schröder, 1990, (Annelida: Syllidae: Syllinae) from Philippines Islands, pp. 156-168 in Zootaxa 3734 (2) on page 163, DOI: 10.11646/zootaxa.3734.2.4, http://zenodo.org/record/21693
Terahertz wavefronts measured using the Hartmann sensor principle
No full textWe demonstrate for the first time that the Hartmann wavefront sensor (HWS) principle can be applied for characterizing the wavefronts of terahertz (THz) electromagnetic radiation. The THz Hartmann wavefront sensor consists of a metallic plate with an array of holes and a twodimensional scanable pyro-electric detector. The THz radiation with different wavefronts was generated by a far-infrared gas laser operated at 2.5 THz in combination with a number of objects that result in known wavefronts. To measure the wavefront, a beam passing through an array of holes generates intensity spots, for which the positions of the individual spot centroids are measured and compared with reference positions. The reconstructed wavefronts are in good agreement with the model expectations.QN/Quantum NanoscienceApplied Science
Is the electromagnetic field responsible for the cosmic acceleration in late times?
No full textWe show that in the realm of general relativity, a nonminimal coupling between the electromagnetic and the gravitational fields may produce an era of accelerated expansion
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