Bond Formation in Electrosorbates

The electrosorption valency y is defined and its meaning is thoroughly discussed. Exiptl. dent. of y is demonstrated for systems Au/Bi3+ and Pt/Cu2+. It is found that for homonuclear ions in aq. solns. the ratio y/z, where z stands for Nernst valency, is successfully correlated with the electro.negativity difference I XM - Xs I of the electrode metal M and the sorbate S. For small electronegativity differences, y/z •is close to unity indicating large covalency. Bond formation in electrosorbates in non-aq. solvents and at single crystal plames of various orientations are briefly discussed

Bond Formation in Electrosorbates

The electrosorption valency y is defined and its meaning is thoroughly discussed. Exiptl. dent. of y is demonstrated for systems Au/Bi3+ and Pt/Cu2+. It is found that for homonuclear ions in aq. solns. the ratio y/z, where z stands for Nernst valency, is successfully correlated with the electro.negativity difference I XM - Xs I of the electrode metal M and the sorbate S. For small electronegativity differences, y/z •is close to unity indicating large covalency. Bond formation in electrosorbates in non-aq. solvents and at single crystal plames of various orientations are briefly discussed

Enhancement of the ferromagnetic order of graphite after sulphuric acid treatment

We have studied the changes in the ferromagnetic behavior of graphite powder and graphite flakes after treatment with diluted sulphuric acid. We show that this kind of acid treatment enhances substantially the ferromagnetic magnetization of virgin graphite micrometer size powder as well as in graphite flakes. The anisotropic magnetoresistance (AMR) amplitude at 300 K measured in a micrometer size thin graphite flake after acid treatment reaches values comparable to polycrystalline cobalt.Comment: 3.2 pages, 4 figure

Grazing Endophyte Infested Tall Fescue and Changes in Bovine Blood Components and Gain

Tall fescue (Festuca arundinacea) is utilized on more than 15 million ha of pasture in the eastern USA and over 80% of the plants in this area are infested with the endophyte Neotyphodium coenophialum. Tall fescue toxicosis results from consumption of the infested (E+) grass host and is an important problem that causes considerable economic loss to producers. However, the agronomic attributes of tall fescue make it an attractive forage because of its ability to withstand cool temperatures, drought, poor soil conditions and intensive defoliation. There is need to understand mechanisms of animal physiology that are affected by the alkaloids produced by the endophyte/grass association. Blood serum samples were collected from steers (Bos taurus) grazing either E+ or endophyte free (E-) tall fescue in spring and summer during three consecutive years and were related to animal performance. Consistent and significant changes associated with E+ tall fescue were noted for daily gain, prolactin, albumin/globulin ratio, alanine aminotransferase, cholesterol, creatinine, globulin, total bilirubin, total serum protein, copper, red blood cells, mean corpuscular volume, mean corpuscular hemoglobin, and eosinophils. Thus, repeatable changes that occur in serum biochemical and blood cellular values of cattle grazing E+ tall fescue were identified and will aid in understanding the pathogenesis of the toxicosis

The Deposition of Metallic Phases on Polymers with Different Electronic Conductivity and Catalytic Activity

The growth of metallic phases and the kinetics of this process are mainly dependent on the electronic conductivity and catalytic activity of the substrate. In this work we used electrodes covered with different polymer films. The conductivity and the number of growth sites of these modified electrodes was changed by the monomer (in the polymer chain or by the polarization. We used the metallic conducting polyaniline as deposited material. From the experimental data current density i and change of mass m as function of time, we got informations about the different steps of electropolymerization as nucleation and growth of a homogeneous film. This investigation shows that the number of growing centers plays an important role and can be varied with the substrate. A modification with semiconducting or insulating polymers, of course, is not useful to accelerate the growth. Further characteristic quantities like the rate of the growth can be calculated and their in-situ-transients are depicted. Additionally the electronic behaviour of the used substrate can be characterized

Extraction of electromagnetic neutron form factors through inclusive and exclusive polarized electron scattering on polarized 3He target

Inclusive 3He(e,e') and exclusive 3He(e,e'n) processes with polarized electrons and 3He have been theoretically analyzed and values for the magnetic and electric neutron form factors have been extracted. In both cases the form factor values agree well with the ones extracted from processes on the deuteron. Our results are based on Faddeev solutions, modern NN forces and partially on the incorporation of mesonic exchange currents.Comment: 28 pages, 29 Postscript figure

Motion Calculations on Stent Grafts in AAA

Endovascular aortic repair (EVAR) is a technique which uses stent grafts to treat aortic aneurysms in patients at risk of aneurysm rupture. Although this technique has been shown to be very successful on the short term, the long term results are less optimistic due to failure of the stent graft. The pulsating blood flow applies stresses and forces to the stent graft, which can cause problems such as breakage, leakage, and migration. Therefore it is of importance to gain more insight into the in vivo motion behavior of these devices. If we know more about the motion patterns in well-behaved stent graft as well as ill-behaving devices, we shall be better able to distinguish between these type of behaviors These insights will enable us to detect stent-related problems and might even be used to predict problems beforehand. Further, these insights will help in designing the next generation stent grafts. Firstly, this work discusses the applicability of ECG-gated CT for measuring the motions of stent grafts in AAA. Secondly, multiple methods to segment the stent graft from these data are discussed. Thirdly, this work proposes a method that uses image registration to apply motion to the segmented stent mode

(Bio-)chemische und physikalische Sensoren auf der Basis eines einzigen Transducerprinzips

Die wichtigste Einheit von modernen Mikroanalysesystemen, wie µTAS (Micro Total Analysis System), „Labor auf einem Chip“, elektronische Zunge, usw. ist die Detektoreinheit. Diese Detektoreinheit besteht in der Regel aus unterschiedlichen (bio-)chemischen und physikalischen Sensoren sowohl für die Kontrolle der (bio-)chemischen und physikalischen Kenngrößen in Flüßigkeiten als auch für die Minimierung oder für die Kompensierung des Einflußes von Störgrößen. Üblicherweise unterscheiden sich die Strukturen bzw. die sensitiven Schichten und Transducersprinzipen der (bio-)chemischen Sensoren von denen, die für physikalische Sensoren anwendbar sind. Deshalb ist die kommerzielle Realisierung solcher Multisensorsysteme häufig problematisch aufgrund der komplizierten Technologie bzw. der höheren Produktionskosten. In diesem Beitrag stellen wir ein neues Konzept für ein multifunktionales hybrides Sensormodul unter dem Einsatz eines einzigen Transducersprinzips auf der Basis der Feldeffektstruktur, sowohl für (bio-)chemische als auch physikalische Sensoren vor. Das entwickelte Sensormodul wird für die Messung von zwei (bio-)chemischen Kenngrößen (pH, Penicillinkonzentration) und drei physikalischen Kenngrößen (Temperatur, Flußgeschwindigkeit bzw. Flußrichtung) unter dem Einsatz von lediglich zwei Sensorstrukturen, einem Ionengenerator und einer Referenzelektrode realisiert und deren Eigenschaften untersucht. Ein pH-sensitiver ISFET (Ionensensitiver Feldeffekttransistor) auf der Basis von Ta2O5 wird als Transducer eingesetzt. Details der experimentellen Ergebnisse, insbesondere Messungen in biologischen Flüssigkeiten, wie im humanen Blut bzw. Urin, werden demonstriert. Perspektiven des neuen Konzepts- „(Bio-)chemische und physikalische Sensoren auf der Basis eines einzigen Transducersprinzips“ werden diskutiert

Tema Con Variazioni: Quantum Channel Capacity

Channel capacity describes the size of the nearly ideal channels, which can be obtained from many uses of a given channel, using an optimal error correcting code. In this paper we collect and compare minor and major variations in the mathematically precise statements of this idea which have been put forward in the literature. We show that all the variations considered lead to equivalent capacity definitions. In particular, it makes no difference whether one requires mean or maximal errors to go to zero, and it makes no difference whether errors are required to vanish for any sequence of block sizes compatible with the rate, or only for one infinite sequence.Comment: 32 pages, uses iopart.cl