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Search Results: 1 - 10 of 5509 matches for " Schmidt "
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Dependence of Gravity Induced Absorption Changes on the Earth’s Magnetic Field as Measured during Parabolic Flight Campaigns  [PDF]
Werner Schmidt
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.411190

Various spectroscopic experiments performed on the AIRBUS ZERO G—located in Bordeaux, France—in the years 2002 to 2012 exhibit minute optical reflection/absorption changes (GIACs) as a result of gravitational changes between 0 and 1.8 g in various biological species such as maize, oats, Arabidopsis and particularly Phycomyces sporangiophores. During a flight day, the AIRBUS ZERO G conducts 31 parabolas, each of which lasts about three minutes including a period of 22 s of weightlessness. So far, we participated in 11 parabolic flight campaigns including more than 1000 parabolas performing various kinds of experiments. During our campaigns, we observed an unexplainable variability of the measuring signals (GIACs). Using GPS-positioning systems and three dimensional magnetic field sensors, these finally were traced back to the changing earth’s magnetic field associated with the various flight directions. This is the first time that the interaction of

Gravireception in Phycomyces: Threshold Determination on the Sounding Rocket TEXUS 50  [PDF]
Werner Schmidt
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.610143
Abstract: Under parabolic flight conditions microgravity is not lower than 3 to 5 times 10-2 g. In contrast to parabolic flights, sounding rocket flights are virtually vibrational-free allowing microgravity as low as 10-5 g. Thus, a rotating platform serving as centrifuge allows the precise generation of gravitational forces ranging from 5 to 100 mg (not possible during parabolic flights). On this basis we determined the threshold1 for optical reflection/absorption changes in Phycomyces to be lower than 25 × 10-3 g. This compares well with the threshold determination of gravitropism in Phycomyces on a clinostat centrifuge. Kinetics of gravity-induced absorption changes and gravity as generated by the on-board centrifuge do not coincide but show a distinctive hysteresis with a latency of 4 s (75 mg-ramp, pull-up).
Hyper Gravity-Induced Transients in Phycomyces as Measured by Single Beam Spectrophotometer on the Sounding Rocket TEXUS 50  [PDF]
Werner Schmidt
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.92019
Abstract: In the first paper of two referring to the TEXUS 50 campaign using micro dual wavelength spectrometers (MDWS) we kinetically determined the threshold1 for GIACs (gravity-induced absorption changes) in Phycomyces to be lower than 25 × 103 g (http://file.scirp.org/pdf/JMP_2015082810060783.pdf). In this second paper, we attended measurement of GIAC-spectra. Unexpectedly, during the upwards movement, i.e. the hypergravity phase up to top acceleration values reaching 11.6 g at 35.4 s after liftoff we observed transient GIAC-spectra ranging from 380 to 750 nm. In addition, during the whole acceleration phase of 68.2 s, another component near 700 nm develops which remains stable during the whole “free fall trajectory parabola” for 381.3 s. The subsequent reentry of the rocket leads to extraordinary deceleration values up 37.8 g, completely destroying Phycomyces sporangiophores excluding their spectral measurement. During the microgravity phase and by centrifuge operation we were unable to detect any GIAC-spectra (in contrast to kinetic MDWS-measurements, first paper).
Creativity in Science: Tensions between Perception and Practice  [PDF]
Adele L. Schmidt
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.25063
Abstract: Many countries are reviewing science education programmes and implementing new pedagogical paradigms aimed at reversing a trend of declining enrolments. A key factor in this decline is a public perception that science is not a creative endeavour. Attempts to reframe public perception tend to focus on primary and secondary schooling, but do little to address ongoing declines in quality and originality of intellectual output beyond the highschool environment. To overcome systemic devaluation of science requires appreciation of the complex, dynamic, and often stochastic, interplay of sociocultural, psychological and cognitive factors that drive human creativity. Viewing creativity from this perspective reveals tensions between perception and practice that limit opportunities for students, science educators and scientists. Resolving the tension requires integration of developmental, psychometric and sociocultural discourses of creativity in ways that generate opportunities for individuals at all levels of education and practice to: 1) acquire a high level of domain-specific knowledge; 2) practise application of that knowledge in developing solutions to problems across a gradient of difficulty and; 3) be challenged to integrate their knowledge of science with their knowledge of other fields to pursue and solve problems with personal relevance.
A Novel Outage Capacity Objective Function for Optimal Performance Monitoring and Predictive Fault Detection in Hybrid Free-Space Optical and RF Wireless Networks  [PDF]
Barnet M. Schmidt
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.54038
Abstract: This study develops an optimal performance monitoring metric for a hybrid free space optical and radio wireless network, the Outage Capacity Objective Function. The objective function—the dependence of hybrid channel outage capacity upon the error rate, jointly quantifies the effects of atmospheric optical impairments on the performance of the free space optical segment as well as the effect of RF channel impairments on the radio frequency segment. The objective function is developed from the basic information-theoretic capacity of the optical and radio channels using the gamma-gamma model for optical fading and Ricean statistics for the radio channel fading. A simulation is performed by using the hybrid network. The objective function is shown to provide significantly improved sensitivity to degrading performance trends and supports of proactive link failure prediction and mitigation when compared to current thresholding techniques for signal quality metrics.
The Perils of Outcomes-Based Education in Fostering South African Educational Transformation  [PDF]
Michèle J. Schmidt
Open Journal of Political Science (OJPS) , 2017, DOI: 10.4236/ojps.2017.73030
Abstract: This chapter explored a South African education policy. Specifically the author?examined outcomes-based learning and the implications of this borrowed curriculum in South African schools.?The author?focused on curriculum as a?platform for discussion of the unique approach?that?the South African government employed to modify their adoption of democracy and transformation. Unfortunately, many scholars reluctantly concede that South Africa’s?ambitious policy initiatives failed to provide social justice in schools.?Education?is often the driving force in society: socially, economically, and politically. In particular, education can either liberate social ideologies or become a tool to reinforce stratification. With a political ideology of democracy emerging in South Africa, one would think that democratic educational structures would act to diminish race, class and gender inequalities; however, this has not been a pervasive result.
Flexibility and Political Biases in Elections with Retrospective Voting  [PDF]
Robert C. Schmidt
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.810106
Abstract: This paper characterizes the optimal degree of flexibility in a dynamic model where two candidates compete in elections repeatedly. Giving the winner of an election some flexibility to depart from an earlier campaign promise is crucial due to new information that can arrive after the election. However, too much flexibility implies that candidates follow primarily their own biases. It is shown that first-best policies can be implemented for any realization of the state in all periods, in spite of candidates’ known biases. This is achieved via retrospective voting, by adjusting the probability of reelecting the incumbent to her implemented policy.
Some Applications of Optimal Control in Sustainable Fishing in the Baltic Sea  [PDF]
Dmitriy Stukalin, Werner H. Schmidt
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.27115
Abstract: Issues related to the implementation of dynamic programming for optimal control of a three-dimensional dynamic model (the fish populations management problem) are presented. They belong to a class of models called Lotka-Volterra models. The existence of bionomic equilibria will be considered. The problem of optimal harvest policy is then solved for the control of various classes of its behaviour. Therefore the focus will be the optimality conditions by using the Bellman principle. Moreover, we consider a different form for the optimal value of the control vector, namely the feedback or closed-loop form of the control. Academic examples are studied in order to demonstrate the proposed methods.
I like it but I don’t have time to tell patients’ families: Exploring barriers and facilitators of pain and dementia knowledge flow between healthcare providers and family caregivers  [PDF]
Cary A. Brown, Ashley Schmidt
Advances in Aging Research (AAR) , 2012, DOI: 10.4236/aar.2012.13008
Abstract: Pain in persons with dementia is prevalent, largely undetected, and undertreated within the care setting. Family members require resources to help them assume a more significant role in pain assessment and management. This report outlines a psycho-educational online resource developed to address these needs. The report explores the apparent disconnect between the positive evaluation healthcare providers gave the resource and their infrequent rate of referring family caregivers to the resource. We apply a Sticky Knowledge framework to examine these complex and incongruent findings and conclude that health literacy and knowledge translation strategies need to focus directly on family care- givers as opposed to adhering to a more traditional biomedical model in which healthcare professionals assumed the primary responsibility for gatekeeping and knowledge dissemination.
Proximal White Onychomycosis in an Immunocompetent Patient: A Case Report  [PDF]
Brian M. Schmidt, Crystal Holmes
Case Reports in Clinical Medicine (CRCM) , 2015, DOI: 10.4236/crcm.2015.41010
Objective: Onychomycosis is a diagnosis of fungal organisms in the nail unit. It frequently occurs in both the immunocompetent and immunocompromised patient. A variant of onychomycosis is proxiaml onychomycosis that occurs on the most proximal aspect of the nail. Proximal onychomycosis is known to be commonly associated with immunocompromised status. Study Design: A case report of a veteran who presented a dermatology clinic with complaint of solitary nail discoloration that was recalcitrant to over-the-counter therapy including topical hydrogen peroxide and foot soaks without improvement. Results and Conclusions: This individual case report demonstrates that pedal proximal onychomycosis can be associated with non-dermatophyte organisms, identified as Fusarium species, in immunocompetent individuals. The finding of pedal proximal onychomycosis caused by a Fusarium non-dermatophytic mold has not been reported. The veteran was successfully cured of the condition with treatment via oral terbinafine for a ninety-day course while monitoring patient’s liver function test for any complications.
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