Preparation,spectral characterization,electrochemistry, EXAFS,antibacterial and catalytic activity of new ruthenium (III) complexes containing ONS donor ligands with triphenylphosphine/arsine

New hexa‐coordinated ruthenium (III) complexes of the type [RuX(EPh₃)₂(L)] (X = Cl or Br; L = dibasic tridentate Schiff base ligand; E = P or As) have been synthesized by the reactions of [RuCl₃(PPh₃)₃], [RuCl₃(AsPh₃)₃] or [RuBr₃(AsPh₃)₃] with the appropriate Schiff base ligands derived by the condensation of salicylaldehyde and 2‐hydroxy‐1‐naphthaldehyde with N(4) substituted thiosemicarbazones. All the new complexes were characterized using various physico‐chemical methods such as elemental analyses, infrared, electron paramagnetic resonance (EPR) spectroscopy, magnetic moment and cyclic voltammetry. Based on the extended X‐ray absorption fine structure (EXAFS) analysis, an octahedral structure has been confirmed for the complexes. The new complexes have been subjected to the catalytic activity and antibacterial studies. Copyright © 2005 John Wiley & Sons, Ltd.     

Oxide reduction and oxygen removal in water-atomized iron powder: a kinetic study

Journal of Thermal Analysis and Calorimetry - The purpose of the present work is to investigate humidification–dehumidification desalination system and to explore the effect of pertinent...     

Bacterial interactions with proteins and cells relevant to the development of life-threatening endocarditis studied by use of a quartz-crystal microbalance

Implant-related infections are a major challenge in clinical routine because of severe complications, for example infective endocarditis (IE). The purpose of this study was to investigate the real-time interaction of S. gordonii with proteins and cells important in the development of IE, in a flow system, by use of a quartz-crystal microbalance (QCM). Acoustic sensors were biologically modified by preconditioning with sterile saliva, platelet-poor plasma (PPP), or platelet-rich plasma (PRP), followed then by perfusion of a bacterial suspension. After perfusion, additional fluorescence and scanning electron microscopic (SEM) studies were performed. The surface structure of S. gordonii was analyzed by atomic force microscopy (AFM). Compared with S. gordonii adhesion on the abiotic sensor surface following normal mass loading indicated by a frequency decrease, adhesion on saliva, PPP, or PRP-conditioned sensors resulted in an increase in frequency. Furthermore, adhesion induced slightly increased damping signals for saliva and PPP-coated sensors but a decrease upon bacterial adhesion to PRP, indicating the formation of a more rigid biofilm. Microscopic analysis confirmed the formation of dense and vital bacterial layers and the aggregation of platelets and bacteria. In conclusion, our study shows that the complex patterns of QCM output data observed are strongly dependent on the biological substrate and adhesion mechanisms of S. gordonii. Overall, QCM sheds new light on the pathways of such severe infections as IE.     

Rank deficiency and superstability of hybrid systems

The objectives of this paper are to study the rank properties of flows of hybrid systems, show that they are fundamentally different from those of smooth dynamical systems, and to consider applications that emphasize the importance of these differences. It is well known that the flow of a smooth dynamical system has rank equal to the space on which it evolves. We prove that, in contrast, the rank of a solution to a hybrid system, a hybrid execution, is always less than the dimension of the space on which it evolves and in fact falls within possibly distinct upper and lower bounds that can be computed explicitly. The main contribution of this work is the derivation of conditions for when an execution fails to have maximal rank, i.e., when it is rank deficient. Given the importance of periodic behavior in many hybrid systems applications, for example in bipedal robots, these conditions are applied to the special case of periodic hybrid executions. Finally, we use the rank deficiency conditions to derive superstability conditions describing when periodic executions have rank equal to 0, that is, we determine when the execution is completely insensitive to perturbations in initial conditions. The results of this paper are illustrated on three separate applications, two of which are models of bipedal walking robots: the classical single-domain planar compass biped and the two-domain planar kneed biped.     

Actively shaped supercontinuum from a photonic crystal fiber for nonlinear coherent microspectroscopy

The combination of broadband pulses from a photonic crystal fiber (PCF) pumped by a standard 100 fs oscillator and pulse shaping is successfully employed for coherently controlled nonlinear spectroscopy. The pulse shaper manages not only to compress the PCF supercontinuum in a closed-loop optimization scheme but also to manipulate the phase at the same time for quantum control applications. This approach is demonstrated by single-beam coherent anti-Stokes Raman microspectroscopy and should be, due to its simplicity, well suited for general applications in nonlinear microscopy.     

日影偏离度与太阳平均磁场的关联

利用西藏羊八井空气簇射阵列1990年6月至1996年8月间观测到的10TeV宇宙线的太阳阴影位置,以及相同期间的太阳表面平均磁场的数值,研究了太阳阴影的偏离度与太阳平均磁场的关系,并结合简单的理论模型对这种关系进行了计算和解释.