178,061 research outputs found
Jeanne Drewes, Assistant Director of the Michigan State University Libraries, talks about "Ediciones Viga," a Cuban artists' cooperative which has produced limited-edition books since 1985
No full textJeanne Drewes, Assistant Director of the Michigan State University Libraries, talks about "Ediciones Vigi\u301a," a Cuban artists' cooperative which has produced limited-edition books since 1985. Drewes explains the hardships faced in Cuba under an American trade embargo and how the Cubans have adapted by making books from all sorts of materials. She answers questions from the audience. Drewes is introduced by MSU Librarian Ruth Ann Jones. Part of the Michigan State University Libraries' Colloquia series. Held at the MSU Main Library
New long-lived particle searches in heavy-ion collisions at the LHC
Get PDFWe show that heavy-ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated new physics scenarios. Compared to proton collisions, they offer several advantages: (i) the number of parton level interactions per collision is larger, (ii) there is no pileup, (iii) the lower instantaneous luminosity compared to proton collisions allows one to operate the LHC experiments with very loose triggers, and (iv) there are new production mechanisms that are absent in proton collisions We focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long-lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well motivated from the viewpoint of searches for new physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
Get PDFFollowing 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
Searching for New Long-Lived Particles in Heavy-Ion Collisions at the LHC
Get PDFWe show that heavy-ion collisions at the LHC provide a promising environment to search for new long-lived particles in well-motivated new physics scenarios. One advantage lies in the possibility to operate the main detectors with looser triggers, which can increase the number of observable events by orders of magnitude if the long-lived particles are produced with low transverse momentum. In addition, the absence of pileup in heavy-ion collisions can avoid systematic nuisances that will be present in future proton runs, such as the problem of vertex misidentification. Finally, there are new production mechanisms that are absent or inefficient in proton collisions. We show that the looser triggers alone can make searches in heavy-ion data competitive with proton data for the specific example of heavy neutrinos in the neutrino minimal standard model, produced in the decay of B mesons. Our results suggest that collisions of ions lighter than lead, which are currently under discussion in the heavy-ion community, are well motivated from the viewpoint of searches for new physics
Intern experience at CH���M Hill, Inc.: an internship report
Get PDFIncludes author's vita"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirement for the degree of Doctor of Engineering."Includes bibliographical referencesA review of the author's internship experience with CH���M HILL, Inc.
during the period September 1975 through May 1976 is presented. During this nine month
internship the author worked as an Engineer II in the Industrial Processes discipline of this
large consulting engineering firm... The author's prime responsibility was as one of three
lead design engineers on the design of a large wastewater treatment facility for a pulp mill
in Hoquiam, Washington owned by ITT Rayonier Inc. The work generally consisted of the design
of individual treatment units and associated piping and pumping. The purpose of the project
was to provide wastewater treatment capabilities that would satisfy the effluent limitations
(standards) imposed upon the mill by the State of Washington Department of Ecology and the
U.S. Environmental Protection Agency. The author's assignment also entailed necessary
interaction with the project manager and other CH���M HILL design engineers and support staff
members, the client's representatives, and representatives of two other consulting engineering
firms working on the project. Thus, the internship position at CH���M HILL provided considerable
experience coordinating the author's work with the work of other engineers, guiding the design
and administrative efforts of a support staff, and interacting regularly with the client and
other consulting firms. This broad exposure to a variety of engineering and organizational
problems provided a valuable educational experience
Cerebral processing of painful oesophageal stimulation:a study based on independent component analysis of the EEG
No full textUdgivelsesdato: MA
Intern experience at the Texas Transportation Institute: an internship report
Get PDF"Submitted to the College of Engineering of Texas A&M University in partial
fulfillment of the requirements for the degree of Doctor of Engineering."Includes vita (leaf 91)Includes bibliographical references (leaf 57)This report discusses the author's engineering experience at the Texas
Transportation Institute (TTI), Texas A&M University from March 1974 through July 1977. A
report of this experience plus twelve additional hours of academic course work were
substituted for an internship according to requirements established by the College of
Engineering. Although the author could not retroactively establish objectives of the type
associated with a typical internship, the work experience gained could be related to the two
general objectives of an intership: 1. To demonstrate an identifiable contribution to the
organization in which the intern served, and 2. To enable the intern to become aware of the
non-technical aspects of working as an engineer in a non-academic environment. While a member
of the Texas Transportation Institute staff, the author worked on a number of projects in the
areas of highway traffic engineering research and the preparation of continuing education
courses for transportation engineering officials. These assignments were contained within the
Urban Transportation Systems Division of TTI. This report delineates the author's contribution
to four particular projects and discusses the technical as well as non-technical experience
gained from each. Having been exposed to more engineering situations than many of the other
Doctor of Engineering students, the author has already formulated some rather specific
milestones for the future. The Doctor of Engineering program is discussed in conjunction with
its potential for helping the author attain these career goals and objectives. Also, some
thoughts are presented regarding the Doctor of Engineering as a viable alternative to the
Ph.D. in preparing for a career in engineering higher education
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
Qualitätssicherung und Qualitätsentwicklung in der Schulpsychologie.
No full textMüller B, von Hagen A, Jeck S. Qualitätssicherung und Qualitätsentwicklung in der Schulpsychologie. . In: Seifried K, Drewes S, Hasselhorn M, eds. Handbuch Schulpsychologie. Stuttgart: Kohlhammer; 2021: 72-84
Venlafaxine and oxycodone have different effects on spinal and supraspinal activity in man:a somatosensory evoked potential study
No full textIntroductionOpioids and antidepressants that inhibit serotonin and norepinephrine reuptake (SNRI) are recognized as analgesics to treat severe and moderate pain, but for both of them the mechanisms in humans remain unclear. This study aimed to explore how oxycodone (opioid) and venlafaxine (SNRI) modulate spinal and supraspinal sensory processing.MethodsTwenty volunteers were included in this randomized, double blinded, three-way (placebo, oxycodone, venlafaxine), cross-over study. Spinal and full scalp cortical evoked potentials (EPs) to median nerve stimulation were recorded before and after five days of treatment. Assessment of central effects of the three treatments involved: 1) amplitudes and latencies of spinal EPs (spinal level), 2) amplitudes and latencies of the P14 potential (subcortical level), 3) amplitudes and latencies of early and late cortical EPs (cortical level), 4) brain sources underlying early cortical EPs and 5) brain networks underlying the late cortical EPs.ResultsIn the venlafaxine arm, the spinal P11 and the late cortical N60-80 latencies were reduced by 1.8%(95%CI:1.7,1.9%) and 5.7%(95%CI:5.3,6.1%), whereas the early cortical P25 amplitude was decreased by 7.1%(95%CI:6.1,8.7%). Oxycodone increased the sub-cortical P14 (+25%(95%CI:22.2,28.6%)), early cortical N30 (+12.9%(95%CI:12.5,13.2%)) amplitudes and the late cortical N60-80 latency (+2.9%(95%CI:1.9,4.0%)). The brainstem and primary somatosensory cortex source strengths were increased by 66.7%(95%CI:62.5,75.0%) and 28.8%(95%CI:27.5,29.6%) in oxycodone arm, whereas the primary somatosensory cortex strength was decreased in venlafaxine arm by 18.3%(95%CI:12.0,28.1%).ConclusionsOpioids and SNRI drugs exert different central effects. This study contributes to the much needed human models of the mechanisms of drugs with effects on the central nervous system. INTRODUCTION: Opioids and antidepressants that inhibit serotonin and norepinephrine reuptake (SNRI) are recognized as analgesics to treat severe and moderate pain, but for both of them the mechanisms in humans remain unclear. This study aimed to explore how oxycodone (opioid) and venlafaxine (SNRI) modulate spinal and supraspinal sensory processing.METHODS: Twenty volunteers were included in this randomized, double blinded, three-way (placebo, oxycodone, venlafaxine), cross-over study. Spinal and full scalp cortical evoked potentials (EPs) to median nerve stimulation were recorded before and after five days of treatment. Assessment of central effects of the three treatments involved: 1) amplitudes and latencies of spinal EPs (spinal level), 2) amplitudes and latencies of the P14 potential (subcortical level), 3) amplitudes and latencies of early and late cortical EPs (cortical level), 4) brain sources underlying early cortical EPs and 5) brain networks underlying the late cortical EPs.RESULTS: In the venlafaxine arm, the spinal P11 and the late cortical N60-80 latencies were reduced by 1.8%(95%CI:1.7,1.9%) and 5.7%(95%CI:5.3,6.1%), whereas the early cortical P25 amplitude was decreased by 7.1%(95%CI:6.1,8.7%). Oxycodone increased the sub-cortical P14 (+25%(95%CI:22.2,28.6%)), early cortical N30 (+12.9%(95%CI:12.5,13.2%)) amplitudes and the late cortical N60-80 latency (+2.9%(95%CI:1.9,4.0%)). The brainstem and primary somatosensory cortex source strengths were increased by 66.7%(95%CI:62.5,75.0%) and 28.8%(95%CI:27.5,29.6%) in oxycodone arm, whereas the primary somatosensory cortex strength was decreased in venlafaxine arm by 18.3%(95%CI:12.0,28.1%).CONCLUSIONS: Opioids and SNRI drugs exert different central effects. This study contributes to the much needed human models of the mechanisms of drugs with effects on the central nervous system. This article is protected by copyright. All rights reserved.</p
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