Materials Literature
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Metal-ceramic microstructures were formed in situ by the partial reduction (i.e. the reduction of only one of the metallic elements) of the spinel compound NiAl2O4. Depending on reduction conditions, these microstructures consist of Ni particles embedded in an α-Al2O3 or a multiphase matrix called ‘defect spinel’. The…
The differential scanning calorimetry (DSC) at different heating rates was used to gain some insight into the thermal stability and calorimetric behaviour of the three-component tellurite silver vanadate glasses of the (TeO2)50–(V2O5)50—x–(Ag2O)ii, where x = 20, 22.5, 25, 27.5 wt%. The glass transformation temperature…
A technique is discussed in this paper for evaluating the performance of IR emitters in heating and drying fabrics. The efficiency of IR heating depends on both the fabric spectral absorption characteristics and the spectral emission of the infrared source. An FTIR spectrometer with an integrating sphere is used to me…
Microstructural evolution of gas‐pressure‐sintered Si 3 N 4 with Yb 2 O 3 as a sintering aid was observed. Microstructures typical for in situ toughened Si 3 N 4 , i.e., large elongated grains randomly distributed in a fine matrix, were observed. However, the size of the elongated grains near the surface was much larg…
The goal of this paper is to emphasize the multidisciplinary character of molecular magnetism as a whole, and of our own activity in this field. For that, we have briefly described some of our results concerning the theoretical simulation of thermodynamical properties of molecular magnetic materials, the study of spin…
Phosphorylase b kinase (PbK) from skeletal muscle is a highly regulated oligomer consisting of four copies of four distinct subunits (alphabetagamma)delta4. The gamma subunit is catalytic, and the remaining subunits are regulatory. To characterize effector-induced changes in the quaternary structure of the enzyme, we…
It has been shown by experimental and theoretical studies that exchange interactions in non planar π systems are strongly dependent on the geometrical parameters characterizing the non planarity. A study of the exchange interaction in isolated nitroxide biradicals is presented for non planar paraphenylene bis nitroxid…
Crystallization of isotactic polypropylene (iPP) in an ethylene–propylene–diene rubber matrix (EPDM), crosslinked with dicumyl peroxide (DCP), has been studied. A discrepancy concerning the degree of crystallinity of the blends determined using different experimental techniques, has been discovered and an effort to ex…
Abstract Octaisopropylmanganocen und Hexa(tert.‐butyl)manganocen zeigen high spin‐Verhalten, während beim 1,1′,2,2′,4,4′‐Hexaisopropyl‐3,3′,5,5′‐tetramethylmanganocen ein spin crossover von der high spin‐ zur low spin‐Konfiguration beim Abkühlen unter −106°C auftritt. 1,1′‐Diisopropyl‐octamethylmanganocen zeigt low sp…
The most effective technologies currently available for controlling NOx emissions from heavy-duty industrial gas turbines are diluent injection in the combustor reaction zone, and lean premixed Dry Low NOx (DLN) combustion. For ultralow emissions requirements, these must be combined with selective catalytic reduction…
Substrate-dependent energy transfer and aggregation in Langmuir−Blodgett (LB) films of 5-(4- N -octadecylpyridyl)-10,15,20-tri- p -tolylporphyrin (porphyrin 338a) have been investigated by ultraviolet−visible (UV−vis) and fluorescence spectroscopies. It has been found that the porphyrin molecules form different kinds…
An avalanche enhanced AlGaAs-GaAs punchthrough heterojunction phototransistor with an improved guard-ring emitter structure has been proposed. It has demonstrated a record high sensitivity of 5790 A/W and optical conversion gain of 10810 at 400-nW incident optical power level. Its novel guard-ring emitter structure ca…
Abstract Crosslinking in AFR700B polyimide was studied using several techniques. Crosslinking could not be detected using Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). Swelling in n‐methyl pyrrolidone (NMP) showed network formation occurs at cure temperatures ≥325°C (617°F…
Abstract tert‐Butanolate von Germanium(II), Zinn(II) und Blei(II) der Formel {M[OC(CH 3 ) 3 ] 2 } n (M Ge, n = 2; M Sn, n = 2; M Pb, n = 3) sowie die entsprechenden Heterometallalkoxide M′M 2 [O‐C(CH 3 ) 3 ] 6 (M Ge, M′ Sr, Ba; M Sn, M′ Ca, Sr, Ba; M Pb, M′ Ca, Ba) wurden in einem CVD‐Prozeß (Chemic…
Plasma-IAD with the APS (advanced plasma source) has been introduced into the market in 1992. Up to now this technique is used worldwide in almost 100 coating systems. A large number of different layer systems has been investigated in R&D and applied in production. For ophthalmic applications plasma-IAD with the APS i…
Anionic random and block copolymerization of isobornyl methacrylate (IBMA) and methyl methacrylate (MMA) has been studied in THF at −78 °C by using (1,1-diphenyl-3,3-dimethylbutyl)lithium (DDBLi) as initiator in the presence of LiCl. The random copolymerization of MMA and IBMA has also been carried out at 0 °C, all th…
All articles of this category The Horner-Wadsworth-Emmons reaction of the first, third and fourth generation of aldehyde terminated dendrimers 1-[Gn] ( n =1: 6 CHO, n =3:24 CHO, n =4:48 CHO groups, respectively) with phosphonates unsubstituted at the carbon α to the phosphoryl group 2a-i affords in moderate yield dend…
The influence of p -acetoxyacetanilide (PAA) as an additive in the surrounding paracetamol solution was investigated during growth and dissolution of paracetamol crystals. The different crystal faces of paracetamol, {110}, {201̄}, and {001}, exhibited two different mechanisms of interaction with the additive. Accordin…
We have developed a technique using laser-light scattering for monitoring and controlling precipitate formation during pulsed-laser deposition of ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ (YBCO) films. By laser ablating a stoichiometric YBCO target under o…
Studies on the synthesis, preliminary in vivo biological activity, singlet oxygen and fluorescence yields of a dimeric porphyrin (D1) are described. The pharmacokinetic behavior and photodynamic properties of the dimer D1 were examined in Balb/c mice bearing an MS-2 fibrosarcoma. Compound D1 shows a high selectivity f…