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Search Results: 1 - 10 of 401456 matches for " M. Wolfes "
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First measurement of target and beam-target asymmetries in the $γ p\to π^0ηp$ reaction
J. R. M. Annand,H. J. Arends,R. Beck,N. Borisov,A. Braghieri,W. J. Briscoe,S. Cherepnya,C. Collicott,S. Costanza,E. J. Downie,M. Dieterle,A. Fix,L. V. Fil'kov,S. Garni,D. I. Glazier,W. Gradl,G. Gurevich,P. H. Barrientos,D. Hamilton,D. Hornidge,D. Howdle,G. M. Huber,V. L. Kashevarov,I. Keshelashvili,R. Kondratiev,M. Korolija,B. Krusche,A. Lazarev,V. Lisin,K. Livingston,I. J. D. MacGregor,J. Mancel,D. M. Manley,P. Martel,E. F. McNicoll,W. Meyer,D. Middleton,R. Miskimen,A. Mushkarenkov,A. Neganov,A. Nikolaev,M. Oberle,H. Ortega,M. Ostrick,P. Ott,P. B. Otte,B. Oussena,P. Pedroni,A. Polonski,V. V. Polyanski,S. Prakhov,G. Reicherz,T. Rostomyan,A. Sarty,S. Schumann,O. Steffen,I. I. Strakovsky,T. Strub,I. Supek,L. Tiator,A. Thomas,M. Unverzagt,Y. A. Usov,D. P. Watts,D. Werthmüller,L. Witthauer,M. Wolfes
Physics , 2015, DOI: 10.1103/PhysRevC.91.055208
Abstract: The first data on target and beam-target asymmetries for the $\gamma p\to\pi^0\eta p$ reaction at photon energies from 1050 up to 1450 MeV are presented. The measurements were performed using the Crystal Ball and TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. The general assumption that the reaction is dominated by the $\Delta 3/2^-$ amplitude is confirmed. The data are in particular sensitive to small contributions from other partial waves.
A new measurement of the neutron detection efficiency for the NaI Crystal Ball detector
M. Martemianov,V. Kulikov,B. T. Demissie,Z. Marinides,C. S. Akondi,J. R. M. Annand,H. J. Arends,R. Beck,N. Borisov,A. Braghieri,W. J. Briscoe,S. Cherepnya,C. Collicott,S. Costanza,E. J. Downie,M. Dieterle,M. I. Ferretti Bondy,L. V. Filkov,S. Garni,D. I. Glazier,D. Glowa,W. Gradl,G. Gurevich,D. Hornidge,G. M. Huber,A. Kaeser,V. L. Kashevarov,I. Keshelashvili,R. Kondratiev,M. Korolija,B. Krusche,A. Lazarev,J. M. Linturi,V. Lisin,K. Livingston,I. J. D. MacGregor,D. M. Manley,P. P. Martel,D. G. Middleton,R. Miskimen,A. Mushkarenkov,A. Neganov,A. Neiser,M. Oberle,M. Ostrick,P. Ott,P. B. Otte,B. Oussena,P. Pedroni,A. Polonski,S. Prakhov,G. Ron,T. Rostomyan,A. Sarty,D. M. Schott,S. Schumann,V. Sokhoyan,O. Steffen,I. I. Strakovsky,Th. Strub,I. Supek,M. Thiel,A. Thomas,M. Unverzagt,Yu. A. Usov,S. Wagner,D. P. Watts,J. Wettig,D. Werthmuller,L. Witthauer,M. Wolfes
Physics , 2015, DOI: 10.1088/1748-0221/10/04/T04001
Abstract: We report on a measurement of the neutron detection efficiency in NaI crystals in the Crystal Ball detector obtained from a study of single p0 photoproduction on deuterium using the tagged photon beam at the Mainz Microtron. The results were obtained up to a neutron energy of 400 MeV. They are compared to previous measurements made more than 15 years ago at the pion beam at the BNL AGS.
Measurement of pi^0 photoproduction on the proton at MAMI C
P. Adlarson,F. Afzal,C. S. Akondi,J. R. M. Annand,H. J. Arends,Ya. I. Azimov,R. Beck,N. Borisov,A. Braghieri,W. J. Briscoe,S. Cherepnya,F. Cividini,C. Collicott,S. Costanza,A. Denig,E. J. Downie,M. Dieterle,M. I. Ferretti Bondy,L. V. Fil'kov,A. Fix,S. Gardner,S. Garni,D. I. Glazier,D. Glowa,W. Gradl,G. Gurevich,D. J. Hamilton,D. Hornidge,G. M. Huber,A. K?ser,V. L. Kashevarov,S. Kay,I. Keshelashvili,R. Kondratiev,M. Korolija,B. Krusche,V. V. Kulikov,A. Lazarev,J. Linturi,V. Lisin,K. Livingston,I. J. D. MacGregor,D. M. Manley,P. P. Martel,M. Martemianov,J. C. McGeorge,W. Meyer,D. G. Middleton,R. Miskimen,A. Mushkarenkov,A. Neganov,A. Neiser,M. Oberle,M. Ostrick,P. Ott,P. B. Otte,B. Oussena,D. Paudyal,P. Pedroni,A. Polonski,V. V. Polyanski,S. Prakhov,A. Rajabi,G. Reicherz,G. Ron,T. Rostomyan,A. Sarty,D. M. Schott,S. Schumann,C. Sfienti,V. Sokhoyan,K. Spieker,O. Steffen,I. I. Strakovsky,Th. Strub,I. Supek,M. F. Taragin,A. Thiel,M. Thiel,L. Tiator,A. Thomas,M. Unverzagt,Yu. A. Usov,S. Wagner,D. P. Watts,D. Werthmüller,J. Wettig,L. Witthauer,M. Wolfes,R. L. Workman,L. A. Zana
Physics , 2015, DOI: 10.1103/PhysRevC.92.024617
Abstract: Differential cross sections for the gamma p -> pi^0 p reaction have been measured with the A2 tagged-photon facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W=1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of pi^0 photoproduction data by ~47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented.
Measurements of Double-Polarized Compton Scattering Asymmetries and Extraction of the Proton Spin Polarizabilities
P. P. Martel,R. Miskimen,P. Aguar-Bartolome,J. Ahrens,C. S. Akondi,J. R. M. Annand,H. J. Arends,W. Barnes,R. Beck,A. Bernstein,N. Borisov,A. Braghieri,W. J. Briscoe,S. Cherepnya,C. Collicott,S. Costanza,A. Denig,M. Dieterle,E. J. Downie,L. V. Fil'kov,S. Garni,D. I. Glazier,W. Gradl,G. Gurevich,P. Hall Barrientos,D. Hamilton,D. Hornidge,D. Howdle,G. M. Huber,T. C. Jude,A. Kaeser,V. L. Kashevarov,I. Keshelashvili,R. Kondratiev,M. Korolija,B. Krusche,A. Lazarev,V. Lisin,K. Livingston,I. J. D. MacGregor,J. Mancell,D. M. Manley,W. Meyer,D. G. Middleton,A. Mushkarenkov,B. M. K. Nefkens,A. Neganov,A. Nikolaev,M. Oberle,H. Ortega Spina,M. Ostrick,P. Ott,P. B. Otte,B. Oussena,P. Pedroni,A. Polonski,V. Polyansky,S. Prakhov,A. Rajabi,G. Reicherz,T. Rostomyan,A. Sarty,S. Schrauf,S. Schumann,M. H. Sikora,A. Starostin,O. Steffen,I. I. Strakovsky,T. Strub,I. Supek,M. Thiel,L. Tiator,A. Thomas,M. Unverzagt,Y. Usov,D. P. Watts,L. Witthauer,D. Werthmüller,M. Wolfes
Physics , 2014, DOI: 10.1103/PhysRevLett.114.112501
Abstract: The spin polarizabilities of the nucleon describe how the spin of the nucleon responds to an incident polarized photon. The most model-independent way to measure the nucleon spin polarizabilities is through polarized Compton scattering. Double-polarized Compton scattering asymmetries on the proton were measured in the $\Delta(1232)$ region using circularly polarized incident photons and a transversely polarized proton target at the Mainz Microtron. Fits to asymmetry data were performed using a dispersion model calculation and a baryon chiral perturbation theory calculation, and a separation of all four proton spin polarizabilities in the multipole basis was achieved. The analysis based on a dispersion model calculation yields $\gamma_{E1E1} = -3.5 \pm 1.2$, $\gamma_{M1M1}= 3.16 \pm 0.85$, $\gamma_{E1M2} = -0.7 \pm 1.2$, and $\gamma_{M1E2} = 1.99 \pm 0.29$, in units of $10^{-4}$ fm$^4$.
Measurement of the transverse target and beam-target asymmetries in $η$ meson photoproduction at MAMI
C. S. Akondi,J. R. M. Annand,H. J. Arends,R. Beck,A. Bernstein,N. Borisov,A. Braghieri,W. J. Briscoe,S. Cherepnya,C. Collicott,S. Costanza,E. J. Downie,M. Dieterle,A. Fix,L. V. Fil'kov,S. Garni,D. I. Glazier,W. Gradl,G. Gurevich,P. Hall Barrientos,D. Hamilton,D. Hornidge,D. Howdle,G. M. Huber,V. L. Kashevarov,I. Keshelashvili,R. Kondratiev,M. Korolija,B. Krusche,A. Lazarev,V. Lisin,K. Livingston,I. J. D. MacGregor,J. Mancel,D. M. Manley,P. Martel,E. F. McNicoll,W. Meyer,D. Middleton,R. Miskimen,A. Mushkarenkov,B. M. K. Nefkens,A. Neganov,A. Nikolaev,M. Oberle,M. Ostrick,H. Ortega,P. Ott,P. B. Otte,B. Oussena,P. Pedroni,A. Polonski,V. V. Polyanski,S. Prakhov,G. Reicherz,T. Rostomyan,A. Sarty,S. Schumann,O. Steffen,I. I. Strakovsky,Th. Strub,I. Supek,L. Tiator,A. Thomas,M. Unverzagt,Yu. A. Usov,D. P. Watts,D. Werthmüller,L. Witthauer,M. Wolfes
Physics , 2014, DOI: 10.1103/PhysRevLett.113.102001
Abstract: We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the $\vec \gamma \vec p\to\eta p$ reaction up to a center-of-mass energy of W=1.9 GeV. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of $\eta$ meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.
Study of Duct Characteristics Deduced from Low Latitude Ground Observations of Day-Time Whistler at Jammu  [PDF]
M. Altaf, M. M. Ahmad
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.33032
Abstract:

Propagation characteristics of low latitude whistler duct characteristics have been investigated based on day-time measurements at Jammu. The morphogical characteristics of low latitude whistlers are discussed and compared with characteristics of middle and high latitude whistlers. The Max. electron density (Nm) at the height of the ionosphere obtained from whistler dispersion comes out to be higher than that of the background which is in accordance with the characteristics of whistler duct. The equivalent width is found to be close to the satellite observations and the characteristics of whistler duct in low latitude ionosphere are similar to those in middle and high latitude ionosphere. The width of ducts estimated from the diffuseness of the whistler track observed during magnetic storm is found to lie in the range of 50 - 200 Km.

Review Article: Immobilized Molecules Using Biomaterials and Nanobiotechnology  [PDF]
Magdy M. M. Elnashar
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2010, DOI: 10.4236/jbnb.2010.11008
Abstract: Immobilized molecules using biomaterials and nanobiotechnology is a very interesting topic that touching almost all aspects of our life. It uses the sciences of biology, chemistry, physics, materials engineering and computer science to develop instruments and products that are at the cutting edge of some of today’s most promising scientific frontiers. In this review article, the author based on his experience in this arena has tried to focus on some of the supports for im-mobilization; the most important molecules to be immobilized such as DNA, cells, enzymes, metals, polysaccharides, etc and their applications in medicine, food, drug, water treatment, energy and even in aerospace. He specified a special section on what is new in the arena of supports and technologies used in enzyme immobilization and finally a recommendation by the author for future work with a special attention to up-to-date references.
Using of the generalized special relativity (GSR) in estimating the neutrino masses to explain the conversion of electron neutrinos  [PDF]
M. H. M. Hilo
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.34044
Abstract: In this work the Generalized Special Relativity (GSR) is utilized to estimate masses of some elementary particles such as, neutrinos. These results are found to be in conformity with experimental and theoretical data. The results obtained may explain some physical phenomena, such as, conversion of neutrinos from type to type when solar neutrino reaches the Earth.
Postischemic Lower Extremity Wounds Treated with and without Negative Pressure Dressing  [PDF]
Naz?mmü?
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.37075
Abstract: Background: Vacuum-assisted dressing is a noninvasive closure system of the wound, which makes localized and controlled negative pressure. Its mechanical tension reduces edema, stimulates granulation tissue formation and angiogenesis, and prepares the wound bed for closure. In this study, a patient has been presented, who suffered from serious lower extremity wounds due to arterial emboli, one of her wounds has been treated with vacuum-assisted dressing and the other with conventional dressing to evaluate the efficacy of vacuum-assisted dressing in acute ischemic wounds. Methods: A 65-year-old female patient was admitted to the emergency clinic, due to complaint of severe pain in her right lower extremity which suggested an acute arterial occlusion. She immediately underwent an embolectomy operation; however, a few days later, severe ischemia on the leg and foot became appearant. All of the necrosis was sharply debrided under sterile conditions in the operating room, and then lower leg wound was covered with vacuum-assisted dressing, also calcaneal wound was dressed with silver sulphadiazine. Results: Eighteen days after the first dressing with negative pressure, distal leg wound became ready for closure, whereas, enough granulation tissue over the calcaneal area developed merely thirty-four days later. Calcaneal wound closed spontaneously within fifty-three days. Conclusions: When dealing with this experience, using the negative pressure dressing in patient with severe lower limb wounds following arterial emboli, accelerates wound healing by means of developing the granulation tissue, and rapidly prepares the wound for closure, so it may reduce the risk of amputation.
Laplace Transform Method for Unsteady Thin Film Flow of a Second Grade Fluid through a Porous Medium  [PDF]
M. Ali, M. Awais
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53017
Abstract:

In this article, we have effectively used the Numerical Inversion of Laplace transform to study the time-dependent thin film flow of a second grade fluid flowing down an inclined plane through a porous medium. The solution to the governing equation is obtained by using the standard Laplace transform. However, to transform the obtained solutions from Laplace space back to the original space, we have used the Numerical Inversion of Laplace transform. Graphical results have been presented to show the effects of different parameters involved and to show how the fluid flow evolves with time.

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