OALib Journal期刊

ISSN: 2333-9721




2018 ( 11 )

2017 ( 4 )

2016 ( 4 )

2015 ( 340 )


匹配条件: “Schmidt” ,找到相关结果约5505条。
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).
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.
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.
Bench and Bedside
Christian Schmidt
Molecular Cancer , 2002, DOI: 10.1186/1476-4598-1-1
Abstract: This open access, online journal is interested in a wide range of manuscripts presenting original research and commentary. For original research, the common thread is that the work should reveal novel concepts of broad importance to the scientific community. Molecular Cancer publishes Reviews, Original research, Case reports, Short communications and Hypotheses.Reviews are invited and should be of public interest. The common thread of Original research and Case reports is that they reveal novel concepts of wide importance and interest to the scientific community, with conclusions that deliver a substantial advance in understanding of an important problem. Short communications are preliminary results of exceptional interest that are particularly topical and relevant, and for which fast publication is essential. Hypotheses are ideas or critics of ideas with discussion that will deliver a substantial advance in the understanding of an important problem.I obtained my Ph.D. from the University of Rostock, Germany, for my work on mechanotransduction [1]. From my collaborations with scientists at biotech companies and with clinicians, I came to recognise the need for a dynamic forum that fosters the exchange of ideas across the entire cancer community. We now have an opportunity to make Molecular Cancer just such a journal, and this is an exciting challenge. Assisting me in this new venture are Guido M. Sclabas, as Deputy Editor, and R. Scott Heller as Associate Editor. Guido has a background in surgical oncology and growth factor signalling. Scott's research focuses on Wnt signalling and pancreas development.For Molecular Cancer to become an exciting forum for cancer research, we need you to contribute your most innovative and significant work in the cancer field. In exchange, Molecular Cancer will strive to provide a fast, fair, and constructive review process; the highest quality production values; and a dedicated team of professional scientific editors, who are willing
Book Review of "The Molecular Biology of Cancer" by Stella Pelengaris, Michael Khan (Editors)
Christian Schmidt
Molecular Cancer , 2007, DOI: 10.1186/1476-4598-6-72
Abstract: There are a fair number of books, dealing with cancer biology; unfortunately, they arelimited to certain cancertypes and dated. Here, Pelengaris and Khan familiarize the reader with the cancer cell in Chapter one and selected human cancers in Chapter two. A capturing, comprehensive, clearly written and absolutely accurateintroduction into cancer biology, necessary to understand how tumors evolve, develop and progress is offered in Chapters three through fourteen. This book deserves great praise for the readable presentation of this complex field. Nothing is simplified for the sake of the flow of the text. A brief description of the content of Chapters three to fourteen is presented below.Chapter three focuses on 'nature and nurture in oncogenesis' with emphasis on the role of environmental carcinogens and the influence of environmental as well as individual risk factors on development and progression of cancers along with a brief introduction into the multi-stage-concept of cancers. DNA replication and cell cycle are discussed in Chapter four. Here, concepts like duplication of DNA, addiction of cancer cells to oncogenes and phases/checkpoints of the cell cycle & currently accepted understanding of signaling cascades, utilized to tightly control the progression through the cell are presented and discussed. In turn, the foundation to comprehend one of the hallmarks of cancer – uncontrolled progression through the cell cycle – is provided. Logically, interested readers find an introduction into the regulation of growth in Chapter five. For example, growth factors and cognate receptors, signaling pathways, cellular senescence, apoptosis and survival are elegantly introduced and woven into an appropriately simplified view with plenty of cited reference for further reading. A more detailed discussion of oncogenes and tumor suppressor genes is the given in the next two Chapters, followed by an expanded introduction into the cell death in Chapter eight. Cellular senescence
Amor de lejos: la emigración de México a Estados Unidos
Schmidt, Samuel;
Norteamérica , 2008,
Abstract: this article maintains that migration is a structural phenomenon. it argues that the united states does not recognize itself as a party to creating impoverishment and that its recognition would lead to a solution; on the contrary, the u.s. criminalizes immigrants’ labor and tries to seal the border. the author maintains that military and police measures to stop migratory flows are not viable and presents a series of recommendations to deal with migration.

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