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Search Results: 1 - 10 of 20477 matches for " Cristina Solomon "
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A Case Study Concerning Sales Prediction Using Sales Quantitative Prediction Methods
Simona Elena Dragomirescu,Daniela Cristina Solomon
Annals of Dunarea de Jos , 2010,
Abstract: The sales condition the entire activity of a enterprise, its variation being considered the main risk factor on the performances and financial position of the enterprise. The importance of elaboration of such budget is given by: (a) on long term: the establishing of the investments and financing plans; (b) on medium term: the establishing of publicity and promotion expenses budget; and (c) on short term: the determination of the production level, of supply program, the optimization of labor force. In planning the sales volume, there exist several methods, from which we remind: causal method, non-causal method, direct method, indirect method, judgment and statistic methods. All these methods have advantages and disadvantages. Quantitative methods are the methods that in predictions’ realization start from numbered statistic data. The linear adjustment, correlation may be applied for the general tendencies of sales evolution research, when the tendency is linear.
Influence of the sample anticoagulant on the measurements of impedance aggregometry in cardiac surgery
Cristina Solomon,Michael Winterhalter,Isabel Gilde,Ludwig Hoy
Medical Devices: Evidence and Research , 2008,
Abstract: Cristina Solomon1, Michael Winterhalter1, Isabel Gilde1, Ludwig Hoy2, Andreas Calatzis3, Niels Rahe-Meyer11Department of Anesthesiology, Hannover Medical School, Hannover, Germany; 2Institute for Biometry, Hannover Medical School, Hannover, Germany; 3Department Hemostasis Transfusion Medicine, University Hospital Munich, Munich, GermanyBackground: The standard method of assessment of platelet function is represented by light transmission aggregometry (LTA), performed in citrated platelet-rich plasma (PRP). With LTA, decrease and subsequent post-cardiopulmonary bypass (CPB) recovery of platelet function have been reported during cardiac surgery. Multiple electrode aggregometry (MEA) may be used as point-of-care method to monitor perioperative changes in platelet function. Since MEA assesses macroaggregation which is influenced by the plasmatic levels of unbound calcium, citrate may be inadequate as anticoagulant for MEA. We used citrate and heparin for MEA samples, to see with which anticoagulant the intraoperative decrease and postoperative recovery in platelet function previously described with other aggregometric methods in cardiac surgery may be observed with MEA.Methods: Blood was obtained from 60 patients undergoing routine cardiac surgery and the samples were collected in standard tubes containing unfractionated heparin (50 U/mL) or trisodium citrate (3.2%). The samples were obtained before CPB, at 30 minutes on CPB, end of CPB and on the first postoperative day. MEA was performed using the Multiplate analyzer. Collagen (COLtest, 100 μg/mL) and TRAP-6 (thrombin receptor activating peptide, TRAPtest, 1mM/mL) were used as aggregation agonists.Results: Platelet aggregometric response decreased significantly during CPB. Platelet aggregation assessed using TRAP-6 as agonist on heparinized blood significantly correlated with the duration of CPB (r = 0.41, p = 0.001, 2-tailed Pearson test). The aggregometric analysis performed on the first postoperative day showed a significant recovery in platelet activity in the samples containing heparin (increase from 30 ± 22 U to 46 ± 27 U for the COLtest and from 70 ± 34 U to 95 ± 32 U for the TRAPtest, p < 0.001, Student’s t-test), while no significant recovery of platelet function could be established in the MEA measurements performed with citrated blood.Conclusions: The choice of blood sample anticoagulant used for impedance aggregometry influenced the platelet aggregation response. Postoperative platelet function recovery was only detected in the heparinized samples. Heparin seems to be better suited than cit
Necrotizing Fasciitis of the Upper and Lower Limbs: Port Harcourt Experience  [PDF]
Rollings Jamabo, Solomon Elenwo
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.22017
Abstract: Background: Necrotizing fasciitis (NF) is a rare but life-threatening soft-tissue infection characterized by rapidly spreading inflammation and subsequent necrosis of the fascial planes and surrounding tissue. Aim: To determine the clinical characteristics at presentation, causative pathogens and clinical outcome of NF after aggressive management. Patients and methods: We retrospectively reviewed case notes of patients with NF referred to the Teaching Hospital in Port Harcourt from January 2004 to December 2009. Results: The case notes of over 2,280 patients with history of cellulitis and/or infections of the upper and lower limbs were reviewed. These cases were seen in a five-year period from 2004 to 2009. Seventy five (3.29%) patients had a diagnosis of necrotizing fasciitis and were evaluated. Only those with infections on the lower and upper limbs were further analyzed. Thirty five (46.67%) patients had their infections in the lower limb while 40 (53.33%) patients had their infections in the upper limb. Twenty (26.67%) patients were found to be diabetic on admission. Thirty (30%) patients sustained injuries on their limbs while 5 (6.67%) patients could not give account of their infections. Eleven (14.66%) patients had fixed flexion deformities as their wounds healed and had to have further plastic surgery to extend their limbs and 7 (9.33%) patients died while on admission. Conclusion: Although an early diagnosis of NF can be difficult, a high index of suspicion is required in all patients presenting with unexplained warmth and/or cellulitis of the limbs, so that prompt and aggressive debridement can be carried out with commencement of broad spectrum antibiotics.
More Compactification for Differential Systems  [PDF]
Harry Gingold, Daniel Solomon
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.31A027
Abstract:

This article is a review and promotion of the study of solutions of differential equations in the neighborhood of infinity via a non traditional compactification. We define and compute critical points at infinity of polynomial autonomuos differential systems and develop an explicit formula for the leading asymptotic term of diverging solutions to critical points at infinity. Applications to problems of completeness and incompleteness (the existence and nonexistence respectively of global solutions) of dynamical systems are provided. In particular a quadratic competing species model and the Lorentz equations are being used as arenas where our technique is applied. The study is also relevant to the Painlevé property and to questions of integrability of dynamical systems.

New Evidence, Conditions, Instruments & Experiments for Gravitational Theories  [PDF]
Benjamin T. Solomon
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48A018
Abstract:

Two significant findings compel a rethink of physical theories. First, using a 7-billion-year-old gamma-ray burst, Nemiroff (2012) showed that quantum foam could not exists. And second, Solomon (2011) showed that gravitational acceleration is not associated with the gravitating mass, that gravitational acceleration g is determined solely by τ the change in time dilation over a specific height multiplied by c2 or g = τc2. Seeking consistency with Special Theory of Relativity, as means to initiate this rethink, this paper examines 12 inconsistencies in physical theories that manifest from empirical data. The purpose of this examination is to identify how gravitational theories need to change or be explored, to eliminate these 12 inconsistencies. It is then proposed that spacetime is much more sophisticated than just a 4-dimensional continuum. And, that the Universe consists of at least two layers or “kenos” (Greek for vacuous), the 4-dimensional kenos, spacetime (x, y, z,

A paradigm for a skin graft substitute  [PDF]
Denis E. Solomon
Open Journal of Regenerative Medicine (OJRM) , 2013, DOI: 10.4236/ojrm.2013.22005
Abstract:

Skin grafts have remained relatively unchanged since their introduction as a medical treatment for burns/wounds. This paper seeks to open an academic discussion as to whether their use-by date has now been passed. A skin graft substitute is described in a paradigm using fine leaf gelatine sheets which inherently possess several distinct advantages including, discarding the harvest of autologous tissue from patient donor sites. A clinical study will be needed to determine its suitability taken together with the understanding that experimental animal studies may not provide unequivocal answers to its in situ modus operandi.

Human dermal reticular fibroblasts at confluence display a signature micro pattern in vitro  [PDF]
Denis E. Solomon
Open Journal of Regenerative Medicine (OJRM) , 2013, DOI: 10.4236/ojrm.2013.24014
Abstract:

This paper sets out to demonstrate that scraping of the flat dorsal surface of human dermis with a scalpel blade and cell plating without centrifugation can lead to the recognition and identification of the individual packing micro pattern of dermal reticular fibroblasts at confluence. The characteristic alignment of papillary and reticular fibroblasts at right angles to each other led to the positive identification of reticular fibroblasts. A non-enzymatic means of sub-culturing (passaging), which yields fully functional, healthy cells with normal, phenotypic morphology is also described. Implications for published subcutaneous wound healing studies are discussed as well as the confluent reticular fibroblast configuration, interpreted as ananatomic site identity code,which may be the address of a specific fibroblast gene pattern expression.

Scientific Viewpoints with Emphasis on Dermal Cellular Regeneration in Wound Sites  [PDF]
Denis E. Solomon
Open Journal of Regenerative Medicine (OJRM) , 2014, DOI: 10.4236/ojrm.2014.31003
Abstract:

The human dermis presents an ongoing problem for regenerative medicine. Current medical management uses various acellular dermal matrices on wound sites. The challenge for scientists is to examine, then to question accepted conventional wisdom and to present new concepts. In this paper, Autologous Cell Therapy will be described by using cell culture of autologous dermal fibroblasts and their extracellular matrix as a foundation for rebuilding the dermis in conditioned wound beds. This proposal seems to create a conflict with the medical approach to keeping a wound bed moist.

Stability of Accretion Discs around Magnetized Stars  [PDF]
Solomon Belay Tessema
International Journal of Astronomy and Astrophysics (IJAA) , 2014, DOI: 10.4236/ijaa.2014.42026
Abstract:
We study the stability of accretion disc around magnetised stars. Starting from the equations of magnetohydrodynamics we derive equations for linearized perturbation of geometrically thin, optically thick axisymmetric accretion disc with an internal dynamo around magnetized stars. The structure and evolution of such discs are governed by an evolution equation for matter surface density ∑(R,T). Using the time-dependent equations for an accretion disc we do a linear stability analysis of our steady disc solutions in the presence of the magnetic field generated due to an internal dynamo.
Non-Classical Formulation of Photon Energy for the Degenerate Parametric Oscillator  [PDF]
Solomon G. Belete
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.515149
Abstract: We have analyzed photon statistics and quadrature squeezing of the signal mode produced by one-mode subharmonic generator. It is found that the mean photon energy of the signal mode is twice of a twin signal light beam. And the energy fluctuations of the two signal light beams are four times that of one of the signal light beams. We have also shown that the photon energy quadrature squeezing of the output signal mode is exactly equal to that of the cavity signal mode. In light of this, the global quadrature squeezing of the signal mode is independent of the mean photon energy. On the basis of the above results, the quantum analysis of a one-mode sub-harmonic generating system should somehow be modified.
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