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Search Results: 1 - 10 of 4836 matches for " Tim Hoffman "
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Perfect interference-less absorption at infrared frequencies by a van der Waal's crystal
D. G. Baranov,J. H. Edgar,Tim Hoffman,Nabil Bassim,Joshua D. Caldwell
Physics , 2015, DOI: 10.1103/PhysRevB.92.201405
Abstract: Traditionally, efforts to achieve perfect absorption have required the use of complicated metamaterial-based structures as well as relying on destructive interference to eliminate back reflections. Here, we have demonstrated both theoretically and experimentally that such perfect absorption can be achieved using a naturally occurring material, hexagonal boron nitride (hBN) due to its high optical anisotropy without the requirement of interference effects to absorb the incident field. This effect was observed for p-polarized light within the mid-infrared spectral range, and we provide the full theory describing the origin of the perfect absorption as well as the methodology for achieving this effect with other materials. Furthermore, while this is reported for the uniaxial crystal hBN, this is equally applicable to biaxial crystals and more complicated crystal structures. Interference-less absorption is of fundamental interest to the field of optics; moreover, such materials may provide additional layers of flexibility in the design of frequency selective surfaces, absorbing coatings and sensing devices operating in the infrared.
A Study on Configuration and Integration of Sub-Systems to System-of-Systems with Rule Verification  [PDF]
Tim Warnecke
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.710056
Abstract: Increasing complexity of today’s software systems is one of the major challenges software engineers have to face. This is aggravated by the fact that formerly isolated systems have to be interconnected to more complex systems, called System-of-Systems (SoS). Those systems are in charge to provide more functionality to the user than all of their independent sub-systems could do. Reducing the complexity of such systems is one goal of the software engineering paradigm called component-based software engineering (CBSE). CBSE enables the developers to treat individual sub-systems as components which interact via interfaces with a simulated environment. Thus those components can be developed and implemented independently from other components. After the implementation a system integrator is able to interconnect the components to a SoS. Despite this much-used approach it is possible to show that constraints, which are valid in an isolated sub-system, are broken after this system is integrated into a SoS. To emphasize this issue we developed a technique based on interconnected timed automata for modelling sub-systems and System-of-Systems in the model checking tool UPPAAL. The presented modelling technique allows it to verify the correctness of single sub-systems as well as the resulting SoS. Additionally we developed a tool which abstracts the complicated timed automata to an easy to read component based language with the goal to help system integrators building and verifying complex SoS.
Benefits of complementary therapies
Caroline Hoffman
Breast Cancer Research , 2007, DOI: 10.1186/bcr1807
Abstract: The benefits of complementary therapies to help with the side effects of conventional breast cancer treatment are examined in the following areas: pain and surgery, chemotherapy, radiotherapy, hormonal treatments, and psychoemotional and survival issues. Potential interactions between nonprescription medicines and cancer treatments and cost-effectiveness is also touched upon.Although it is recognized in many of these areas larger and more rigorous trials must be performed, this paper hopes to give some indication of areas in which further research is warranted.Pain, particularly postoperatively, may be ameliorated with complementary therapies. Reiki has been found to be helpful in pain control (1 to 4 days) in cancer patients [1], whereas acupuncture increases pain relief and improves arm movement after surgery [2]. Massage and acupuncture can help to decrease pain and depressive mood [3], and ear acupuncture decreases pain intensity [4]. Hypnotic-type methods involving relaxation, suggestion and imagery, as well as support groups and healing touch, have some impact on cancer pain [5,6], and hypnosis decreases pain intensity, unpleasantness, discomfort, nausea, fatigue and emotional upset after surgery for breast cancer [7].Chemotherapy's unpleasant short-term and long-term side-effects may be ameliorated by using complementary therapies. Nausea and vomiting is eased by stimulation to the P6 point using acupuncture [8] and acupressure when self-administered [9], but not as well by wrist bands applied to that point [10,11]. Pain, mood disturbance and fatigue were improved by massage and healing touch [12], whereas reflexology lessened anxiety regarding chemotherapy [13].Group relaxation with guided imagery reduced fatigue and improved sleep difficulties, whereas cognitive behavioural group intervention reduced external health locus of control [14]. Anthroposophic mistletoe extracts can improve quality of life and reduce side-effects of chemotherapy [15]. Mucositis ca
Book Review:Die noodkreet van jongmense wat hulself sny. Pastoraat aan die self-mutileerder
L Hoffman
Acta Theologica , 2012,
Abstract: A review is given of the book by W. Coetzer on pastoral care to people involved in cutting themselves. Die noodkreet van jongmense wat hulself sny. Pastoraat aan die self-mutileerder [Self-sny, Cutting](Potchefstroom: Potchefstroomse Teologiese Publikasies, 2012). 116 pp. Sagteband. ISBN 978-0-8695-5197-4 The review and the book are in Afrikaans
Book Review: Between the real and the ideal. Ministerial formation in South African churches
L Hoffman
Acta Theologica , 2012,
Abstract: Naidoo, Marily (Ed.) Between the real and the ideal. Ministerial formation in South African churches (Pretoria: Unisa Press, 2012). 184 pp. Paperback. ISBN 978-1-86888-692-0
HIV/AIDS in Cuba: a model for care or an ethical dilemma?
SZ Hoffman
African Health Sciences , 2004,
Abstract: No s. African Health Sciences Vol.4(3) 2004: pp.208-209
Keramiek / Ceramics
Ruan Hoffman
Tydskrif vir letterkunde , 2004,
Post-mortem changes in the physical meat quality characteristics of refrigerated impala M. longissimus dorsi
LC Hoffman
South African Journal of Animal Science , 2004,
Abstract: The effect of aging the M. longissimus dorsi of 13 impala at 4 oC over a ten-day period was investigated. Large variation between animals was observed for the percentages drip and cooking loss as well as for the CIELab colour (L*, a*, b*) values. No trend could be observed for these physical characteristics over time. Means for all traits correspond to that reported in the literature for this species. Similarly, the tenderness of the muscle varied between the animals. However, the tenderness (as measured by a Warner Bratzler shear apparatus) of the muscle generally improved with time. The quadratic equation y = -0.0817x2 + 0.4468x + 10.477 best described (R2 = 0.32) this improvement in tenderness. The implications of this result is that fresh game meat producers can de-bone carcasses after 24 hours post mortem and leave the primal cuts to age in vacuum bags in the chiller, thereby utilizing the available chiller space more efficiently. South African Journal of Animal Science Supp 2 2004: 26-28
Desigualdade da distribui o da renda no Brasil: a contribui o de aposentadorias e pens es e de outras parcelas do rendimento domiciliar per capita Inequality of income distribution in Brazil: the contribution of pensions and of other components of per capita household income
Rodolfo Hoffman
Economia e Sociedade , 2009, DOI: 10.1590/s0104-06182009000100007
The "View Thing" Outside Academia
Philip Hoffman
Ecology and Society , 2003,
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