Characterization of glow‐discharge–treated cellulose acetate membrane surfaces for single‐layer enzyme electrode studies

Cellulose acetate membranes (CA) were modified by means of plasma polymerization of ethylene diamine (EDA) and n‐butylamine (n‐BA). The motivation for this work was the application of a modified membrane for the single‐layer enzyme electrode. A tubular reactor with the external radiofrequency (13.56 MHz) excitation was used. Surface modification was performed at 5, 10, and 15 W power (at 27 Pa working pressure) for 5, 10, 15 min. Modified surfaces were characterized in detail by FTIR–ATR, XPS (ESCA), contact angle, and enzyme immobilization activity. The best treatment results were obtained for EDA with 5 W and 30 min and 15 W and 10 min. These results are discussed using surface analysis data. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1341–1352, 2001     

Working Memory Capacity and the Antisaccade Task: Individual Differences in Voluntary Saccade Control.

Performance on antisaccade trials requires the inhibition of a prepotent response (i.e., don't look at the flashing cue) and the generation and execution of a correct saccade in the opposite direction. The authors attempted to further specify the role of working memory (WM) span differences in the antisaccade task. They tested high- and low-span individuals on variants of prosaccade and antisaccade trials in which an eye movement is the sole requirement. In 3 experiments, they demonstrated the importance of WM span differences in both suppression of a reflexive saccade and generation of a volitional eye movement. The results support the contention that individual differences in WM span are not exclusively due to differences in inhibition but also reflect differences in directing the focus of attention. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

High-capacity quantum key distribution using Chebyshev-map values corresponding to Lucas numbers coding

We propose an approach that achieves high-capacity quantum key distribution using Chebyshev-map values corresponding to Lucas numbers coding. In particular, we encode a key with the Chebyshev-map values corresponding to Lucas numbers and then use k-Chebyshev maps to achieve consecutive and flexible key expansion and apply the pre-shared classical information between Alice and Bob and fountain codes for privacy amplification to solve the security of the exchange of classical information via the classical channel. Consequently, our high-capacity protocol does not have the limitations imposed by orbital angular momentum and down-conversion bandwidths, and it meets the requirements for longer distances and lower error rates simultaneously.     

Numerical optimal control of the wave equation: optimal boundary control of a string to rest in finite time

In many real-life applications of optimal control problems with constraints in form of partial differential equations (PDEs), hyperbolic equations are involved which typically describe transport processes. Since hyperbolic equations usually propagate discontinuities of initial or boundary conditions into the domain on which the solution lives or can develop discontinuities even in the presence of smooth data, problems of this type constitute a severe challenge for both theory and numerics of PDE constrained optimization.     

Über die Altersbestimmung von Eichenholz in Norddeutschland mit Hilfe der Dendrochronologie

Zusammenfassung Die M?glichkeiten einer Alterbestimmung von Eichenholz in Norddeutschland mit Hilfe der dendrochronologischen Methode wurden an einigen Beispielen aufgezeigt und er?rtert. Daraus kann man folgern, da? eine dem Süden entsprechende Standardkurve für Norddeutschland nicht aufgebaut werden kann. Eine erfolgreiche Absolutdatierung ist meist nur mit Hilfe von gesicherten, streng standort-bezogenen Kurven durchführbar. Aber auch Relativdatierungen geben h?ufig genügend Aufschlu?. Die Altersbestimmungen der Klosteranlage Wienhausen/Celle bzw. der ausgegrabenen Siedlung Haithabu mit Hilfe norddeutscher Standortchronologien zeigen den Wert und die M?glichkeit der dendrochronologischen Datierung in Norddeutschland. Mitunter k?nnen Absolutdatierungen auch mit der süddeutschen Standardkurve erfolgen, wenn n?mlich Holz aus südlicheren Gegenden in Norddeutschland verbaut wurde. Auf diese Weise lie? sich die Bauzeit der mittelalterlichen Bremer Kogge ermitteln.

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On the dating of oakwood in Northern Germany by the dendrochronological method

Summary The possibilities of dating oakwood by the dendrochronological method have been demonstrated and discussed in relation to specimens from various sites in Northern Germany. It has been shown that a standard growth-ring series, such as that corresponding to the whole of Southern Germany, cannot be established for Northern Germany. In most cases a successful dating can be realized only by means of a definite growth-ring series related to a narrow site. However, the correlation between older and younger materials often procides sufficient information. The determination of the age of the monastry in Wienhausen/Celle and of the excavated settlement Haithabu illustrates the value and the possibilities of dendrochronology in Northern Germany. Absolute dating occasionally may be possible with the standard growth-ring series of Southern Germany; namely where wood from southern regions has been used in Northern Germany. In this way the date of construction of the Bremer Kogge was determined.

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Herrn Prof. Dr. Hans Mayer-Wegelin zur Vollendung des 70. Lebensjahres gewidmet.     

A review of instance selection methods

In supervised learning, a training set providing previously known information is used to classify new instances. Commonly, several instances are stored in the training set but some of them are not useful for classifying therefore it is possible to get acceptable classification rates ignoring non useful cases; this process is known as instance selection. Through instance selection the training set is reduced which allows reducing runtimes in the classification and/or training stages of classifiers. This work is focused on presenting a survey of the main instance selection methods reported in the literature.     

Copper-Tungsten Composites Sprayed by HVOF

Copper and copper-tungsten composite coatings were produced by high-velocity oxy-fuel spraying (HVOF). After initial optimization of the spraying parameters, coatings of various compositions were made and their structure, composition, mechanical, thermal, and electrical properties were characterized. The HVOF technique was able to produce rather dense coatings with minimal oxide content and relatively good mechanical and thermal properties compared to, for example, plasma-sprayed coatings; however, the achieved tungsten content was quite low.