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Search Results: 1 - 10 of 167580 matches for " E. Dekemper "
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Zernike polynomials applied to apparent solar disk flattening for pressure profile retrievals
E. Dekemper,F. Vanhellemont,N. Mateshvili,G. Franssens
Atmospheric Measurement Techniques (AMT) & Discussions (AMTD) , 2013, DOI: 10.5194/amt-6-823-2013
Abstract: We present a passive method for the retrieval of atmospheric pressure profiles based on the measurement of the apparent flattening of the solar disk as observed through the atmosphere by a spaceborne imager. This method was applied to simulated sunsets. It relies on accurate representation of the solar disk, including its limb darkening, and how its image is affected by atmospheric refraction. The Zernike polynomials are used to quantify the flattening in the Sun images. The inversion algorithm relies on a transfer matrix providing the link between the atmospheric pressure profile and a sequence of Zernike moments computed on the sunset frames. The transfer matrix is determined by a training dataset of pressure profiles generated from a standard climatology. The performance and limitations of the method are assessed by two test cases. Pressure profiles similar to the training dataset show that retrieval error can be up to 10 times smaller than the natural variability in the lower mesosphere, and up to 500 times smaller in the upper troposphere. Tests with other independent profiles emphasize the need for better representativeness of the training dataset.
Zernike polynomials applied to apparent solar disk flattening for pressure profile retrievals
E. Dekemper,F. Vanhellemont,N. Mateshvili,G. Franssens
Atmospheric Measurement Techniques Discussions , 2012, DOI: 10.5194/amtd-5-7535-2012
Abstract: We present a passive method for the retrieval of atmospheric pressure profiles based on the measurement of the apparent flattening of the solar disk as observed through the atmosphere by a spaceborne imager. It involves accurate simulations of the solar occultation and uses the Zernike moments to quantify the flattening. This method is expected to achieve retrievals up to the lower mesosphere with uncertainties 10 to 1000 times smaller than the natural variability.
Zernike polynomials applied to apparent solar disk flattening for pressure profile retrievals
E. Dekemper, F. Vanhellemont, N. Mateshvili, G. Franssens, D. Pieroux, C. Bingen, C. Robert,D. Fussen
Atmospheric Measurement Techniques (AMT) & Discussions (AMTD) , 2013,
Abstract: We present a passive method for the retrieval of atmospheric pressure profiles based on the measurement of the apparent flattening of the solar disk as observed through the atmosphere by a spaceborne imager. This method was applied to simulated sunsets. It relies on accurate representation of the solar disk, including its limb darkening, and how its image is affected by atmospheric refraction. The Zernike polynomials are used to quantify the flattening in the Sun images. The inversion algorithm relies on a transfer matrix providing the link between the atmospheric pressure profile and a sequence of Zernike moments computed on the sunset frames. The transfer matrix is determined by a training dataset of pressure profiles generated from a standard climatology. The performance and limitations of the method are assessed by two test cases. Pressure profiles similar to the training dataset show that retrieval error can be up to 10 times smaller than the natural variability in the lower mesosphere, and up to 500 times smaller in the upper troposphere. Tests with other independent profiles emphasize the need for better representativeness of the training dataset.
A global climatology of the mesospheric sodium layer from GOMOS data during the 2002–2008 period
D. Fussen, F. Vanhellemont, C. Tétard, N. Mateshvili, E. Dekemper, N. Loodts, C. Bingen, E. Kyr l , J. Tamminen, V. Sofieva, A. Hauchecorne, F. Dalaudier, J.-L. Bertaux, G. Barrot, L. Blanot, O. Fanton d'Andon, T. Fehr, L. Saavedra, T. Yuan,C.-Y. She
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: This paper presents a climatology of the mesospheric sodium layer built from the processing of 7 years of GOMOS data. With respect to preliminary results already published for the year 2003, a more careful analysis was applied to the averaging of occultations inside the climatological bins (10° in latitude-1 month). Also, the slant path absorption lines of the Na doublet around 589 nm shows evidence of partial saturation that was responsible for an underestimation of the Na concentration in our previous results. The sodium climatology has been validated with respect to the Fort Collins lidar measurements and, to a lesser extent, to the OSIRIS 2003–2004 data. Despite the important natural sodium variability, we have shown that the Na vertical column has a marked semi-annual oscillation at low latitudes that merges into an annual oscillation in the polar regions,a spatial distribution pattern that was unreported so far. The sodium layer seems to be clearly influenced by the mesospheric global circulation and the altitude of the layer shows clear signs of subsidence during polar winter. The climatology has been parameterized by time-latitude robust fits to allow for easy use. Taking into account the non-linearity of the transmittance due to partial saturation, an experimental approach is proposed to derive mesospheric temperatures from limb remote sounding measurements.
Cluster Model of Formation of Subnuclear and Subatomic Objects  [PDF]
E. E. Lin
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53018
Abstract:

The paper describes the development results on one-dimensional (1D) asymptotic model of the formation kinetics for the objects (clusters) of subnuclear (quark) and subatomic (nuclear) matters. A concept of the objects distribution density wave φ(a, t) in space of sizes a lies in the basis for analytical description of the processes under consideration. The proposed formalism makes it possible to describe in an adequate way the final outcomes of the well-known catastrophic phenomena in the world of elementary particles. Mass characteristics of different processes of approach to equilibrium in nuclear reactions are calculated.

The Gene as Natural Nanomaterial for Treatment of Diseases  [PDF]
E. E. Escultura
Open Journal of Biophysics (OJBIPHY) , 2017, DOI: 10.4236/ojbiphy.2017.71003
Abstract: As an application of the grand unified theory (GUT) to medicine, this paper introduces two natural nanomaterials—the gene and electromagnetic wave. They are involved in the proposed treatment of genetic and infectious diseases. It introduces the superstring as the fundamental building block of matter and the basic constituent of dark matter, one of the two fundamental states of matter. It also introduces the primum, unit of visible or ordinary matter, the other fundamental state of matter. They are convertible to each other by the action of basic cosmic or electromagnetic waves. Eleven biological laws define biology as a biological and physical theory. The gene is the primitive ingredient of living things and, therefore, the beginning of biological life and the virus the simplest living thing. Treatment ranges from genetic modification and alteration to remove undesirable symptom through genetic sterilization to stop the spread of the disease and outright destruction of the disease. Genetic sterilization and outright destruction apply also to infectious diseases. The paper concludes with a blueprint for research and development of appropriate technologies for the treatment.
Extensions of the Constructivist Real Number System  [PDF]
E. E. Escultura
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.88044
Abstract: The paper reviews the most consequential defects and rectification of traditional mathematics and its foundations. While this work is only the tip of the iceberg, so to speak, it gives us a totally different picture of mathematics from what we have known for a long time. This journey started with two teasers posted in SciMath in 1997: 1) The equation 1 = 0.99… does not make sense. 2) The concept \"\"?does not exist. The first statement sparked a debate that raged over a decade. Both statements generated a series of publications that continues to grow to this day. Among the new findings are: 3) There does not exist nondenumerable set. 4) There does not exist non-measurable set. 5) Cantor’s diagonal method is flawed. 6) The real numbers are discrete and countable. 7) Formal logic does not apply to mathematics. The unfinished debate between logicism, intuitionism-constructivism and formalism is resolved. The resolution is the constructivist foundations of mathematics with a summary of all the rectification undertaken in 2015, 2016 and in this paper. The extensions of the constructivist real number system include the complex vector plane and transcendental functions. Two important results in the 2015 are noted: The solution and resolution of Hilbert’s 23 problems that includes the resolution of Fermat’s last theorem and proof Goldbach’s conjecture.
ЕЛЕКТРОХ М ЧНИЙ СИНТЕЗ Д ОКСИДУ МАНГАНУ В ПРИСУТНОСТ ОН В Fe2+ ТА Co2+ Electrochemical synthesis of manganese dioxide in the presence of ions Fe2+ and Co2+ Электрохимический синтез диоксида марганца в присутствии ионов Fe2+ и Co2+
Г.В. Сокольський,Н.Д. ?ванова,С.В. ?ванов,E.?. Болдир?в
Proceedings of National Aviation University , 2009,
Abstract: Зразки д оксиду мангану отримано методом анодного осадження з фторвм сних електрол т в на основ сульфату мангану у присутност дом шок он в двовалентних зал за або кобальту. Отриман продукти характеризувалися методами ААС та ДТА. Проанал зовано вплив дом шок он в зал за кобальту на х м чний склад отриманих зразк в Manganese dioxide samples have been prepared by the anode deposition from fluoride containing electrolytes based on manganese sulphate at the presence of additives of iron(II), cobalt(II) ions. Obtained materials were characterised with AAS and DTA. The influence of doping by ions of iron(II) and cobalt(II) on the chemical composition of the samples obtained has been analysed. Образцы диоксида марганца получены методом анодного осаждения из фторсодержащих электролитов на основе сульфата марганца в присутствии примесей ионов двухвалентных железа или кобальта. Полученные продукты характеризовались методами ААС и ДТА. Проанализировано влияние примесей ионов железа и кобальта на химический состав полученных образцов.
Numerical Investigations of a New N-body Simulation Method  [PDF]
E. Vilkoviskij
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.23016
Abstract: Numerical investigation of a new similarity method (the Aldar-Kose method) for N-body simulations is described. Using this method we have carried out numerical simulations for two tasks: 1) calculation of the temporal behavior of different physical parameters of active galactic nuclei (AGN) containing a super massive black hole (SMBH), an accretion disk, and a compact stellar cluster; 2) calculation of the stellar capture rate to the central SMBH without accretion disk. The calculations show good perspectives for applications of the similarity method to optimize the evolution model calculations of large stellar systems and of AGN.
Studies on TiO2/Reduced Graphene Oxide Composites as Cathode Materials for Magnesium-Ion Battery  [PDF]
E. Sheha
Graphene (Graphene) , 2014, DOI: 10.4236/graphene.2014.33006
Abstract:

The aim of this work is to introduce a high performance cathode for magnesium-ion batteries. TiO2/reduced graphene oxide (rGO) composites were mixed in ball mill. The samples are charac- terized using XRD and SEM. The spex-milled composites exhibit better electrochemical perfor- mance with higher reversible capacity and excellent cyclability. The excellent electrochemical performance of TiO2/rGO composites is due to their unique structures, which intimately combine the conductive graphene nanosheets network with TiO2 nanoparticles and possess the characteristic parallel channels running along the [010] orientation, which allow easy Mg2+ transport. It was found that layered TiO2 and rGO nanosheets in the composite interlace with each other to form novel sandwich-structured microspheres, which exhibit preferable electrochemical performance in rechargeable Mg batteries.

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