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Magnetic Raman Scattering in Two-Dimensional Spin-1/2 Heisenberg Antiferromagnets: Spectral Shape Anomaly and Magnetostrictive Effects
We calculate the Raman spectrum of the two-dimensional (2D) spin-1/2 Heisenberg antiferromagnet by exact diagonalization and quantum Monte Carlo techniques on clusters of up to 144 sites and, on a 16-site cluster, by considering the phonon-magnon interaction which leads to random fluctuations of the exchange integral.…
Synthesis and characterization of fluorinated poly(imide–amide–sulfone)s
Abstract A series of new, fluorinated poly(imide–amide–sulfone)s has been synthesized by solution polycondensation of aromatic diamines containing sulfone groups with diacid chlorides incorporating both imide and hexafluoroisopropylidene units. These polymers are soluble in polar amidic solvents, and their solutions c…
Aldehyde‐Appended Tetraphenylporphyrin: A New Building Block for Porphyrin Arrays
Porphyrin arrays may act as light-harvesting devices which mimic the photosynthetic capture of light. Until now the construction of a variety of arrays has been restricted by the lack of suitable methodology for porphyrin synthesis. A fully conjugated, aldehyde-appended porphyrin building block has been made and its p…
Effects of processing parameters on material properties of mechanically processed polyamide
Abstract A semicrystalline polyamide polymer was processed using a new technique known as mechanical alloying. The material processed by this technique was first introduced into a high‐energy ball mill and ground over long periods of time, resulting in the production of extremely fine powders. These powders were subse…
2‐[p(N‐tert‐butyl‐N‐oxyamino)phenyl]‐4,4,5,5‐tetramethyl‐4,5‐dihydroimidazol‐3‐oxide‐1‐oxyl, a Stable Diradical with a Triplet Ground State
A value of 2.71 μB for the effective magnetic moment between 100 and 300 K is determined for 1. This magnetic moment supports the assumption of a triplet ground state for 1. The bis(nitroxyl) diradical, which melts only at 180 °C with decomposition, could be characterized by X-ray crystallography. It has a distinctly…
A Nickel(II) Azide Cubane: Characterization of the Magnetic Exchange Interactions Mediated by a Triply Bridging Azide Group Bound End‐On
A ferromagnetic exchange interaction that is not influenced by the distortion of the cubane framework of 1 (see picture; only the O atoms of the EtOH and dbm− ligands are shown) and is mediated by the end-on-coordinated μ3-azide bridges has been detected for the first time. Although the unusual [M4(η1-μ3-N3)4] core is…
Collagen turnover and its regulation in the normal and hypertrophying heart
Eighteen different collagen types have now been identified, at least five of which are found in the extracellular matrix of the heart. The interstitial collagens, types I and III are the most abundant components. Due to their tensile strength and arrangement in a network, surrounding and inter-connecting myocytes and…
Model Reactions for Photosynthesis—Photoinduced Charge and Energy Transfer between Covalently Linked Porphyrin and Quinone Units
Abstract Photosynthesis is one of the fascinating fields of current interdisciplinary research. It seems miraculous that nature, in the process of evolution, has managed to bring about the process of photosynthesis. The first step involves a charge separation at the reaction centers, which proceeds with 100% quantum y…
Zur Darstellung und Kristallstruktur eines neuen Kupfer-Antimon-Oxomolybdats: CuSbMo2O8 / On the Synthesis and Crystal Structure of a New Copper Antimony Oxomolybdate: CuSbMo2O8
Abstract Single crystals of the hitherto unknown compound CuSbMo 2 O 8 were prepared by recrystallization from melts in closed copper tubes and investigated by X-ray diffractometer technique. CuSbMo 2 O 8 crystallizes in a new structure type with monoclinic symmetry, space group C 6 2h - I12/a1, a = 5.554(2), b = 4.91…
Thermotropic liquid‐crystalline aromatic polyester‐graft‐poly(2,6‐dimethyl‐1,4‐phenylene oxide) copolymers
Abstract Dicarboxy‐terminated poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) macromonomers were prepared and subjected to the preparation of tailor‐made aromatic thermotropic liquid‐crystalline (LC) polyester‐ graft ‐PPO copolymers. The macromonomers were obtained by hydrolysis of dimethyl carboxylate‐terminated PPO mac…
Das erste Oxogermanat mit „Stuffed Pyrgoms”: CsNa3Li8{Li[GeO4]}4
Abstract Durch Tempern der binären Oxide CsO 0,52 , NaO 0,45 , LiO 0,5 und GeO 2 im mol. Verhältnis 1,24:1,4:6,7:3,9 (Ni‐Bömbchen; 600°C/89 bzw. 65 d) wurden erstmals Einkristalle von CsNa 3 Li 8 {Li[GeO 4 ]} 4 in Form von schwachgelblichen Prismen sowie blaßgelbem Pulver erhalten: Raumgruppe I 4/ m (I. T. Nr. 87) mit…
Numerical method for the performance of a separate-type transformer connected to battery charger
The purpose of this paper is to present an easy method for analyzing the operating characteristics of a separate-type transformer connected to an external circuit including elements such as batteries, resistances, and diodes. This method, a combination of two- and three-dimensional finite element methods, has been app…
Modeling Fission Product Vapor Transport in the Falcon Facility
An extensive database of aerosol experiments exists and has been used for checking aerosol transport codes. Data for fission product vapor transport are harder to find. Some qualitative data are available, but the Falcon thermal gradient tube tests carried out at AEA Technology’s laboratories in Winfrith, England, mar…
Sulfidation of Zinc by Traces of Hydrogen Sulfide in Air
The effect of in the sub‐parts per million range on the atmospheric corrosion of zinc has been investigated in the laboratory. Each sample was exposed individually to air with careful control of pollutant concentration, relative humidity, and flow conditions. Monitoring of concentration at the outlet of the corrosion…
Diamond deposition on carbon fibers
Diamond films have been deposited on carbon fibers with diameters as small as 5 μm by microwave plasma assisted chemical vapor deposition. An ultrasonic pretreatment of the fibers in a bath containing methanol and diamond paste was required for successful coating of the fibers. In the absence of such treatment, the fi…
Electromagnetic field analysis of film transformer
In this paper, we investigate a thin film transformer for small electronic devices. This transformer is composed of the lamination of thin film conductors. Both the primary and secondary coils of the film transformer are arranged coaxially on one layer and multiply laminated. The operation principle of the transformer…
X-ray photoelectron and infrared spectroscopies of Cu-implanted silica and borosilicate glasses
Fourier transform infrared (FTIR) spectra and x-ray photoelectron spectra (XPS) were acquired from Cu implanted in fused silica and a borosilicate glass. The FTIR spectra indicate that Cu ion implantation in the silica and borosilicate glasses results in an intensity decrease in the Si–O stretching vibration. The Si–O…
Texture analysis of chemical vapor deposited diamond films on silicon by the component method
Oriented diamond films have been grown on Si(001) and Si(111) substrates by microwave plasma chemical vapor deposition. X-ray diffractometry has been employed for pole figure measurements which have been evaluated by the component method. This technique can be applied to multiphase materials with overlapping pole figu…
Objective evaluation of a stabilized garment parts handle
Presents the objective evaluation of a stabilized garment parts handle, based on determination of mechanical and physical properties of fabrics using the Kawabata Evaluation System. Parameters that influence the handle are shown on the basis of 16 parameters of mechanical and physical properties of shell fabric, inter…