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Glassy Dynamics in Giant Magnetoresistive Melt - spun Co - Cu
B. Idzikowski,U. K. Röβler,A. Handstein,D. Eckert,M. Wolf,K. Nenkov,K.-H. Müller 한국자기학회 1999 Journal of Magnetics Vol.4 No.3
We report results on metastable CuCo ribbons at low Co contents (2 and 10 at%), which were prepared by conventional melt-spinning technique and subsequent annealing. The properties of these materials cannot consistently be described by those of an assembly of superparamagnetic single-domain particles. Magnetic measurements related to magnetic dynamics reveal spin-glass-like properties. Especially, we find very slow nonequilibrium relaxation processes in Co_(10)Cu_(90), which depend on prehistory, when probing the relaxation of the resistivity. The results are clear evidence for frustrated interaction effects due to magnetic couplings between Co clusters or precipitates in these alloys.
Mueller, Wolf-Detrich,Koo B. Chin Korean Society for Food Science of Animal Resource 2003 한국축산식품학회지 Vol.23 No.4
The objectives of this study were to develop restructured meat products(RMPs) using a transgluta-minase(TGase) and to improve the textural characteristics of RMPs manufactured with pale, soft, exudative(PSE) pork hams. The pH values of RMPs with PSE and normal pork were 5.94 and 6.07, respectively, and their water activity value was approximately 0.981. The RMPs had 70∼72% moisture, 4∼5% fat, 19∼20% protein, and approximately 3% ash contents. No differences in pH, water activity, chemical composition, and hunter color values were observed between RMPs manufactured with normal and PSE pork(p>0.05). However, RMPs containing PSE pork hams had higher drip loss(%)(p>0.05) than those with normal pork hams after 10 days of refrigerated storage. Although no differences were observed in the texture profile analysis(TPA) hardness and sensory evaluation, RMPs with PSE pork hams tended to have more pores and lower binding capacity those with normal pork. This result indicated that additional substrates or longer tumbling time(>4 hr) for the manufacture of RMPs containing PSE pork were required for the products to have similar palatability to those with normal pork.
Advanced technologies for intuitive control and sensation of prosthetics
Erik J. Wolf,Theresa H. Cruz,Alfred A. Emondi,Nicholas B. Langhals,Stephanie Naufel,Grace C. Y. Peng,Brian W. Schulz,Michael Wolfson 대한의용생체공학회 2020 Biomedical Engineering Letters (BMEL) Vol.10 No.1
The Department of Defense, Department of Veterans Aff airs and National Institutes of Health have invested signifi cantlyin advancing prosthetic technologies over the past 25 years, with the overall intent to improve the function, participationand quality of life of Service Members, Veterans, and all United States Citizens living with limb loss. These investmentshave contributed to substantial advancements in the control and sensory perception of prosthetic devices over the past decade. While control of motorized prosthetic devices through the use of electromyography has been widely available sincethe 1980s, this technology is not intuitive. Additionally, these systems do not provide stimulation for sensory perception. Recent research has made signifi cant advancement not only in the intuitive use of electromyography for control but also inthe ability to provide relevant meaningful perceptions through various stimulation approaches. While much of this previouswork has traditionally focused on those with upper extremity amputation, new developments include advanced bidirectionalneuroprostheses that are applicable to both the upper and lower limb amputation. The goal of this review is to examine thestate-of-the-science in the areas of intuitive control and sensation of prosthetic devices and to discuss areas of explorationfor the future. Current research and development eff orts in external systems, implanted systems, surgical approaches, andregenerative approaches will be explored.
Koch, Robert H.,Wolf, George W.,Hull, Anthony B.,Elias, Nicholas M. II,Holenstein, Bruce D.,Mitchell, Richard J. 한국우주과학회 2012 Journal of Astronomy and Space Sciences Vol.29 No.1
This report describes the inception, development and extensive use over 30 years of elliptical polarimeters at the Uni\-versity of Pennsylvania. The initial Mark I polarimeter design utilized oriented retarder plates and a calcite Foster-Clarke prism as the analyzer. The Mark I polarimeter was used on the Kitt Peak 0.9 m in 1969-70 to accomplish a survey of ap\-proximately 70 objects before the device was relocated to the 0.72 m reflector at the Flower and Cook Observatory. Suc\-cessive generations of automation and improvements included the early-80’s optical redesign to utilize a photoelastic modulated wave plate and an Ithaco lock-in amplifier-the photoelastic modulating polarimeter. The final design in 2000 concluded with a fully remote operable device. The legacy of the polarimetric programs includes studies of close binaries, pulsating hot stars, and luminous late-type variables.
Critical Phenomena at the Antiferromagnetic Phase Transition of Azurite
P. T. Cong,B. Wolf,R. S. Manna,A. Br¨uhl,S. K¨ohler,M. Lang 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report on high-resolution acoustic, specific heat and thermal expansion measurements inthe vicinity of the antiferromagnetic phase transition at TN = 1.88 K on a high-quality singlecrystal of the natural mineral azurite. A detailed investigation of the critical contribution to thevarious quantities at TN is presented. The set of critical exponents and amplitude ratios of thesingular contributions above and below the transition indicate that the system can be reasonablywell described by a three-dimensional Heisenberg antiferromagnet.