New Integrable Multi-Component NLS Type Equations on Symmetric Spaces: Z_4 and Z_6 Reductions

The reductions of the multi-component nonlinear Schrodinger (MNLS) type models related to C.I and D.III type symmetric spaces are studied. We pay special attention to the MNLS related to the sp(4), so(10) and so(12) Lie algebras. The MNLS related to sp(4) is a three-component MNLS which finds applications to Bose-Einstein condensates. The MNLS related to so(12) and so(10) Lie algebras after convenient Z_6 or Z_4 reductions reduce to three and four-component MNLS showing new types of chi ^(3)-interactions that are integrable. We briefly explain how these new types of MNLS can be integrated by the inverse scattering method. The spectral properties of the Lax operators L and the corresponding recursion operator Lambda are outlined. Applications to spinor model of Bose-Einstein condensates are discussed.Comment: Reported to the Seventh International conference "Geometry, Integrability and Quantization", June 2--10, 2005, Varna, Bulgari

Fordy-Kulish models and spinor Bose-Einstein condensates

A three-component nonlinear Schrodinger-type model which describes spinor Bose-Einstein condensate (BEC) is considered. This model is integrable by the inverse scattering method and using Zakharov-Shabat dressing method we obtain three types of soliton solutions. The multi-component nonlinear Schrodinger type models related to symmetric spaces C.I Sp(4)/U(2) is studied.Comment: 8 pages, LaTeX, jnmp styl

The Market Reaction to Changes in Disclosure of Related-Party Transaction Rules

We examine the valuation effects of the 2004 changes in Romanian related -party transactions (RPT) disclosure rules. Because the rule changes apply only to companies listed on the Bucharest Stock Exchange (BSE), companies traded on an alternative market (RASDAQ) serve as a natural control group. We find that immediately following the adoption of the rules, BSE firms experience abnormal returns of 6% to 12% relative to matched RASDAQ firms with similar pre-reform characteristics. We also show that in the three-year period following the reforms, BSE firms experience a 20-25% increase in their Tobin’s q. Overall, the results suggest that the implementation of mandatory RPT disclosure rules can be effective in decreasing tunneling and increasing minority valuations in an emerging market

Chemical Bonding in Molecules and Complexes Containing d-Elements Based on DFT

Summary.: Metal-ligand bonding in transition metal halide molecules and complexes with different central ions, oxidations states, and coordination numbers: CrIIIX63−, CrIVX4, CrIIX2 (X = F,Cl,Br,I), MIIICl63−(M = Mo,W), MIII(H2O)63+(M = Cr,Co) and Re2Cl82− has been studied in terms of the Extended Transition State (ETS) energy patitioning scheme within the DFT and electron density analysis (the Laplacian of the electron density and the electronic localization function). Bonding is found to be dominated by ionicity in all cases, especially so for complexes with higher coordination numbers. Covalent contributions to the metal-ligand bond are found to be mainly due to the nd-electrons and to lesser extent due to the metal (n + 1)s and (n + 1)p-orbitals, contributions from (n+1)s increasing when going to lower coordination numbers. Metal-ligand bonding analysis have been used in order to check some concepts emerging from ligand field theory when applied to the spectroscopy and magnetism of transition metal complexes. It is pointed out that for complexes of high symmetry (MX6, Oh, MX4, Td, and MX2, D∞h) electron density analyses gain interpretative power when partitioned into contributions from occupied orbitals of different symmetr

Autologous blood donation in elective surgery of colorectal cancer - is it possible?

Reports from recent studies indicate a causal relationship between all transfusion, infectious complications and recurrent disease in surgical patients. The aim of the presented study is to elucidate the possibilities and indications for autologous haemotransfusion in the elective surgery of the colorectal cancer. Retrospective analysis was per formed over 724 electively operated patients with colorectal cancer. The prospective part includes observation of 20 radically operated patients. In these patients autologous haemotransfusion was per - formed. As indications for autologous haemotransfusion we consider age up to 80 years, hemoglobin levels at least 130 g/l, plasma protein > 65 g/l, body weight > 50 kg, good general condition and absence of decompensated cardiovascular or endocrine dis eases. In two patients with hemoglobin level between 90 - 110 g/l we per formed stimulation by means of Erythropoietin. According to retrospective data ad mission hemoglobin levels varies from 54 g/l to 175 g/l (mean 119 g/l ± 22, 6). From all electively operated patients 33, 9% had hemoglobin values over 130 g/l. The frequency of post-operative infectious complications increases from 9.1% in non-transfused patients to 38,7 % in patients with more than 4 units of allogenic blood trans fused. The prospective part of the study is designed to establish feasibility of the autologous haemotransfusion in clinical practice. The fall of hemoglobin values on the next day after donation varies from 11g/l to 19g/l (mean 15.5 g/l ± 2,19). Erythropoietin stimulation was not found to increase hemoglobin values significantly. There were no complications in the post-operative period in autologous haemotransfusion group with exception of one superficial wound infection. Autologous haemotransfusion is feasible in approximately 1/3 of electively operated patients with colorectal cancer with no ad verse effects or post-operative complications. It de creases the necessity of allogenic bioproducts and hence the risks related. Autologous haemotransfusion is easy to perform and propose ben e fits both from medical and logistic nature. Concerning to stimulation with Erythropoetin in our opinion it is without proven short term efficacy in general surgery so far

Optical Coherent Tomography changes in retinal nerve fiber layer and ganglion cell complex in different stages of open-angle glaucoma

Цел: Да се оценят количествените показатели: ганглийно-клетъчен комплекс (GCC) и перипапиларния неврофибрилерен слой (RNFL ), получени с оптична кохерентна томография (ОСТ) при различни стадии на откритоъгълна глаукома.Методи: Посредством RTVue-100 (Optovue Inc, Fremont, СА) са изследвани 60 очи на З4 болни с откритоъгьлна глаукома и 60 очи на З0 здрави лица. В зависимост от периметричните глобални индекси MD и PSD (Нumphrey analyzer), глаукомните очи са разделени в 2 групи: с начална глаукома ЗЗ очи и с напреднала глаукома 27 очи. На всички обхванати в изследването очи са анализирани GCC и RNFL (по 2 протокола на RTVue - ONH и RNFL З.45).Резултати: Средната стойност на GCC (GCC average) е най-голяма при нормални очи, следвана от тази при глаукомни очи в ранен стадий и глаукомни очи в напреднал стадий (96.7±5.3 с/у 81.0±9.45.3 с/у 75.0±16.8). Между очи с ранна и с напреднала глаукома не се установява статистически значима разлика по отношение на показателите GCC average, GCC superior и GCC inferior. Дебелината на перипапиларния неврофибрилерен слой обаче, измерена и по двата модула, се различава статистически значимо при ранна и напреднала глаукома (Р<0.001).Заключение: Нашите резултати показват, че измерването на перипапиларния RNFL е по-надежден ОСТ-показател за проследяване прогресията на глаукомата.Purpose: To evaluate the quantitative measurements of ganglion cell complex (GCC) and peripapillary retinal nerve fiber layer (RNFL) obtained by optical coherent tomography (OCT) in different stages of open-angle glaucoma.Methods: Sixty eyes of 34 patients with open-angle glaucoma and 60 eyes of 30 healthy people are examined using RTV-ue 100 (Optovue Inc., Fremont, CA). According to visual field global indices MD and PSD (Humphrey Analyzer) glaucomatous eyes are separated into two groups: 33 eyes with early glaucoma and 27 eyes with advanced glaucoma. GCC and RNFL (using two scanning protocols of RTV-ue - ONH and RNFL 3.45) are analyzed in all of the eyes included in the study.Results: GCC average is with highest values in normal eyes, followed by the glaucomatous eyes in early stage and glaucomatous eyes in advanced stage (96.7±5.3ô€‚— versus 81.0±9.4ô€‚— versus 75.0±16.8ô€‚—). Concerning the indices GCC average, GCC superior and GCC inferior in eyes with early and advanced glaucoma statistically significant difference is not found (respectively P=0.081, P=1.00, P=0.335). However, the thickness of the peripapillary nerve fiber layer, measured by the two scanning protocols, is statistically significantly different in early and advanced glaucoma (p<0.001).Conclusion: Our results show that measurement of the peripapillary RNFL is more reliable OCT indicator for follow-up of glaucoma progression