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Search Results: 1 - 10 of 867 matches for " Ghiocel Toma "
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Specific Differential Equations for Generating Pulse Sequences
Ghiocel Toma
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/324818
Abstract: This study presents nonlinear differential equations capable to generate continuous functions similar to pulse sequences. First are studied some basic properties of second-order differential equations with time-dependent coefficients generating bounded oscillating functions similar to test-functions (the function and its derivative  being equal to zero at the same time moments). The necessary intercorrelations between the phase of generated oscillations and the time-dependent coefficients is presented, being shown also that the external command function should be set to a constant value at these time moments so as to determine the amplitude and the sign of generated oscillations. Then some possibilities of using previous differential equation for generating positive-definite functions with null values for the function and its derivative at the same time moments and with constant slope for its amplitude are presented, being shown that the corresponding external command function should present also alternating components. Finally all previous results are used for determining a set of second-order differential equations with time dependent coefficients and a set of external command and corrective functions for generating a pulse sequence useful for modelling time series.
Vanishing Waves on Closed Intervals and Propagating Short-Range Phenomena
Ghiocel Toma,Flavia Doboga
Mathematical Problems in Engineering , 2008, DOI: 10.1155/2008/359481
Abstract: This study presents mathematical aspects of wave equation considered on closed space intervals. It is shown that a solution of this equation can be represented by a certain superposition of traveling waves with null values for the amplitude and for the time derivatives of the resulting wave in the endpoints of this interval. Supplementary aspects connected with the possible existence of initial conditions for a secondorder differential system describing the amplitude of these localized oscillations are also studied, and requirements necessary for establishing a certain propagation direction for the wave (rejecting the possibility of reverse radiation) are also presented. Then it is shown that these aspects can be extended to a set of adjacent closed space intervals, by considering that a certain traveling wave propagating from an endpoint to the other can be defined on each space interval and a specific mathematical law (which can be approximated by a differential equation) describes the amplitude of these localized traveling waves as related to the space coordinates corresponding to the middle point of the interval. Using specific differential equations, it is shown that the existence of such propagating law for the amplitude of localized oscillations can generate periodical patterns and can explain fracture phenomena inside materials as well.
Newton Interpolating Series at Distinct Points with Coefficients in a Real Banach Algebra
Ghiocel Groza,Nicolae Pop
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/365491
Abstract: A real Banach algebra of Newton interpolating series, used to approximate the solutions of multipoint boundary value problems for ODE's, is studied.
Toma ?.
Sport si Societate : Revista de Educatie Fizica, Sport si Stiinte Conexe , 2013,
Abstract: Among the many diseases in humans caused by parasites, hydatid disease, Echinococcosis or hydatid cyst is mostly part of those who have the most severe and varied implications both pathology and among public health problems. Physical therapy as a means of recovery adjuvant drug therapy and psychological diagnoses of hydatid cyst, positive influence symptom relief with effects: objective, demonstrable by clinical examination and subjective characterized by a state of "good "expressed by patients.Material and methodsResearch type case study was conducted over 12 months in 2011 through the practical application of the requirements of the general state of the patient at the time of initial evaluation.ResultsThe patient, aged 52 years presented with a prescription for physical therapy with a diagnosis of bilateral pulmonary hydatid cyst surgery.Kinetic recovery is to minimize the functional disability, as well as facilitation of socio-professional enrollment. Medical history: debut 12 months ago predominant occurrence in environments with high concentrations of dust and post virus.ConclusionsBilateral hydatid cyst is indicated median sternotomy with solving both cysts in one surgical session. For kinetic program to have the best results, patients should be cooperative, to follow the directions and tasks received, be conscientious and not least will have an undeniable. Because results are reflected in the very quality of their lives, their kinetic abilities and skills.
Surface Properties and Compatibility with Blood of New Quaternized Polysulfones  [PDF]
Raluca Marinica Albu, Ecaterina Avram, Iuliana Stoica, Emil Ghiocel Ioanid, Dumitru Popovici, Silvia Ioan
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.22015
Abstract: The paper describes some properties of new quaternized polysulfones obtained by quaternization of chloromethylated polysulfone with different tertiary amines - N,N-dimethylethylamine and N,N-dimethyloctylamine. Hydrophilic/hydrophobic properties, morphological aspects and compatibility with red blood cells and platelets are affected by the alkyl radicals and by history of the formed films. The results obtained are useful in biomedical applications, including evaluation of bacterial adhesion to the surfaces, or utilization of modified polysulfones as semipermeable membranes.
Limnological study of Dokan, Derbendikhan and Duhok lakes, Kurdistan region of Iraq  [PDF]
Janan Jabbar Toma
Open Journal of Ecology (OJE) , 2013, DOI: 10.4236/oje.2013.31003

The present study deals with the assessment of physico-chemical characteristics of Dokan, Derbendikhan and Duhok lakes. The physico-chemical characteristics of these lakes have been studied and analyzed for a year, during January-April-July and October 2009. Seasonal variations of two sampling sites of the lakes have been observed. Various parameters including air temperature, water temperature, electrical conductivity, TDS, pH, total alkalinity, total hardness, dissolved oxygen, calcium, magnesium, sodium, potassium, sulfate, chloride, nitrite and phosphate have been analyzed. The study has revealed that there are significant seasonal variations in some physico-chemical parameters and as a whole most of the parameters are different in the three lakes.

The Theory of Reich's Fixed Point Theorem for Multivalued Operators
Laz?r Tania,Mo? Ghiocel,Petru?el Gabriela,Szentesi Silviu
Fixed Point Theory and Applications , 2010,
Abstract: The purpose of this paper is to present a theory of Reich's fixed point theorem for multivalued operators in terms of fixed points, strict fixed points, multivalued weakly Picard operators, multivalued Picard operators, data dependence of the fixed point set, sequence of multivalued operators and fixed points, Ulam-Hyers stability of a multivalued fixed point equation, well-posedness of the fixed point problem, and the generated fractal operator.
Advanced Signal Processing and Command Synthesis for Memory-Limited Complex Systems
Cristian Toma
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/927821
Abstract: This paper presents advanced signal processing methods and command synthesis for memory-limited complex systems. For accurate measurements performed on limited time interval, some specific methods should be added. For signal processing, a robust filtering and sampling procedure performed on a specific working interval is required, so as the influence of low-amplitude and high-frequency fluctuations to be diminished. This study shows that such a signal processing method for the case of memory-limited complex systems requires the use of certain differentiation/integration procedures performed by oscillating systems, so as robust results suitable for efficient command synthesis to be available. A brief comparison with uncertainty aspects in modern physics (where quantum aspects can be considered as features of complex systems) is also presented.
Display of targets in multiple sclerosis
Tudor Toma
Genome Biology , 2002, DOI: 10.1186/gb-spotlight-20020507-01
Abstract: Lock et al. compared gene expression in acute and chronic MS lesions obtained at autopsy. They observed increased transcripts of genes encoding inflammatory cytokines, particularly interleukin-6 and -17, interferon-? and associated downstream pathways.In addition they chose two of these gene products as targets for therapy in experimental autoimmune encephalomyelitis (EAE), a murine model with similarities to MS. They observed that knocking out granulocyte colony-stimulating factor (upregulated in acute MS lesions) ameliorated EAE in the acute phase. In contrast, knocking out the immunoglobulin Fc receptor common ?chain (upregulated in chronic MS lesions) had the greatest effect on chronic disease."This is the first description supporting molecular differences in the two types of lesions, and provides data that could ultimately influence the choice of treatment for acute versus chronic stages of the disease" write Stephen Tompkins and Stephen Miller of Northwestern University Medical School, Chicago, Illinois, in an accompanying News & Views article.
Neurogenin works in two ways
Tudor Toma
Genome Biology , 2001, DOI: 10.1186/gb-spotlight-20010222-01
Abstract: In the 9 February issue of Cell, Yi Sun and colleagues show how the transcription factor neurogenin (Ngn1) is involved in cell-fate specification (Cell 2001, 104:365-376). Working on cortical stem cells from rats, the researchers demonstrate that the bHLH transcription factor Ngn1, in addition to inducing neurogenesis, inhibits the differentiation of neural stem cells into astrocytes. Ngn1 promotes neurogenesis by functioning as a transcriptional activator. In inhibiting astrocyte differentiation, Ngn1 sequesters the CBP-Smad1 transcription complex away from astrocyte differentiation genes, preventing the activation of the STAT transcription factors necessary for gliogenesis.Thus, two distinct mechanisms employed by the same transcription factor are involved in the activation and suppression of genes during neuronal cell-fate specification.
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