Materials Literature
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A monitoring instrument with novel porous silicon humidity sensors is presented. The sensors feature a humidity-sensitive capacitor with a porous silicon dielectric, as well as two on-chip integrated thermoresistors and a refresh resistor. The capacitance variation upon water uptake is here modelled with an effective…
Abstract Polypropylene containing comminuted fiber reinforced thermoset recyclate has been shown to exhibit enhanced mechanical properties relative to particulate‐filled materials. Optimum mechanical performance in these recyclate‐filled materials is achieved in compositions made from rubber‐modified polypropylene con…
PETI-5 (5000 g mol −1) is a relatively new adhesive and composite matrix that exhibits good processability and excellent properties. However in the fabrication of complex composite parts (i.e. skin stringer and support frames), better processability would offer distinct advantages. In an effort to improve the processa…
Waterborne polyurethane dispersions (PUDs) continue to show growth in commercial usage due to the ever increasing environmental legislation to reduce VOC in coating and adhesive materials. The transition from solvent‐based to waterborne has also been facilitated by advances in both the chemistry and technology employe…
The hydratase-aldolase-catalyzed conversion of trans-o-hydroxybenzylidenepyruvate to salicylaldehyde and pyruvate is an intermediate reaction in the conversion of naphthalene to salicylate by bacteria. Here, a variety of aromatic aldehydes and some nonaromatic aldehydes together with pyruvate have been shown to be sub…
A full scale three-phase multi-stress accelerated electrical aging test facility for stator bars is described. Electrical aging characteristics may be determined under simultaneous electrical, mechanical and electrical stress at either 60 Hz or an accelerated frequency of 400 Hz. Typical initial aging data are present…
The phase evolution of lead titanate processed by the polymeric precursor method was investigated by thermal analysis, X‐ray diffraction, and high‐resolution transmission electron microscopy. The results showed that the cubic perovskite PbTiO 3 (PT) phase is formed from an inorganic amorphous precursor at a temperatur…
Pr2Te2O7: Ein Praseodym(III)-Oxid-Oxotellurat(IV) gemäß Pr2O(TeO3)2 mit Pyrochlor-Struktur Bei Versuchen zur Darstellung von Pr2O2Te durch Umsetzung von elementarem Praseodym mit Tellur(IV)-Oxid (TeO2) im molaren Verhältnis von 2 : 1 bei 850 °C in evakuierten Quarzglasampullen kam es gelegentlich zu unkontrollierten L…
The skin of golfers' hands provides a suitable model to study the effect of chronic sun exposure, because one of their hands is exposed to the outer environment, especially sunlight, while the other one is always protected by a glove during play. Our purpose was to find out the influence of photodamage on the properti…
Radiation doses to both the fingertip and finger base of staff preparing radiopharmaceuticals in a radionuclide dispensary have been monitored for more than 5 years. The records show a fall in dose thought to be due, largely, to the introduction of all-glass (lead) syringe shields. In 1998, the annual radiation dose (…
Data acquisition packages developed at different small angle scattering facilities use different formats both for raw and processed data storage. To facilitate the data exchange between laboratories, a consensus in the small angle scattering community has been reached on an ASCII format for one-dimensional data which…
Degumming with 25% (owO Marsei lle's soap for 1. 5 h at boil gives a weight loss of20.5 %, whereas degumming with enzyme (3 mllg of fabric) at 37()C for 3 h gives a weight loss of about 19.8 %. Treatment with enzyme requires much lower temperature than that in the conventional process. Processing of silk with enzyme u…
In order to improve the biochemical reactivity of the cellulose polymer, which is mainly attributed to the presence of surface hydroxyl groups, derivatized cellulosic membranes have been engineered replacing or masking some or all of the hydroxyl groups in the manufacturing process of the membrane. The present study w…
Abstract Observations of natural minerals and experimental run products show that I-S (illitesmectite mixed-layer minerals) with a high illite content as well as pure mica-illite crystallites can have a lath shape (aspect ratio >3). This shape is common to the I-S minerals under a variety of conditions of formation…
Abstract Monte‐Carlo simulation was used to study the short‐chain branch formation of polyethylene made with a Ni‐diimine catalyst. Branches are formed through the chain‐walking mechanism without any comonomer addition. The model describes the type of branch, that is, methyl, ethyl, propyl, butyl, pentyl, hexyl, hepty…
Abstract A convenient method for the synthesis of poly(butylene succinate) (1) of high molecular weight has been developed. This polyester was prepared readily by the distannoxane-catalyzed polycondensation of succinic acid (2) with 1,4-butanediol (3) in decalin at 190 °C under azeotropic condition. The polycondensati…
A new electrooptical mode was discovered in Deformed Helix Ferroelectric (DHF) liquid crystal cells. This mode appears, if the driving voltage frequency and amplitude are rather high. The electrooptical response time τ0, 1-0, 9 is practically independent on temperature in a very broad range but it strongly depends on…
Abstract The effect of injection molding conditions and reactive compatibilization on the morphology of maleic anhydryde‐modified poly(phenylene oxide)/polyamide‐6 blends was investigated. The injection flow rate primarily influenced the position of the subskin layer, and the injection temperature affected the aspect…
A simple theoretical model is proposed for studying the properties of blended fibrous structures. The model is verified using experimental results from blended yams. The effect on a blended system's properties due to interactions of the different constituents in the blended structure is analyzed, and the parameters in…
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