Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Porphyrin-core dendrimers consisting of benzyl ether dendrons assembled around a porphyrin core have been prepared by two different convergent syntheses. The first involves the direct condensation of convergent dendrons having 3,5-disubstituted benzaldehyde focal points with an equivalent amount of pyrrole. This route…
meso-η1-Palladio- and platinioporphyrins have been isolated for the first time by means of oxidative addition of bromoporphyrins to Pd(0) and Pt(0) complexes; the X-ray crystal structure of the title complex was determined.
Ti-beta catalyses the oxidation of small- and medium-sized silanes to the corresponding silanols by aqueous (30%) H2O2 as oxygen donor with high conversions and excellent selectivity (no disiloxane).
Evolutional changes in interior structures of mixed population biofilms grown on domestic wastewater were quantitatively analyzed using a cryosectioning technique and an image analysis. Meanwhile, transport of particulates into the biofilms was also experimentally investigated using fluorescent microbeads as tracers t…
By surveying the most used methods for evaluating the kinetic parameters from nonisothermal experiments, a new classification scheme of the methods is proposed. For each method the number of principles and theoretical approximations required to derive the equation which grounds it, is considered as a comparison criter…
The crystallisation of xFe 2 O 3 (100-x)P 2 O 5 , (14≤x≤40) glasses has been investigated by differential thermal analysis, x-ray diffraction analysis and Raman spectroscopy. The glasses were heat treated in dry argon from 298 to 1143 K. The crystallisation temperature and number of crystallised phases depended upon t…
Hydrogen outgassing is the most significant factor limiting the attainment of outgassing rates below 10−12 mbar l s−1 cm−2 in stainless steel vacuum systems. This limit turns out to be crucial in very large vacuum systems, like the VIRGO vacuum tubes (2 tubes 1.2 m diam, 3000 m length). Heating the raw material at 400…
A new three phase transformer model is presented in this paper, taking into account air gaps, saturation, core losses, and lamination anisotropy. The flux distribution in a straight overlap joint has been investigated using a lumped circuit model. It is shown that the actual air gap varies largely between an upper and…
The trans-oxamidato-bridged polymeric complexes [Cu2(trans-oxen)(µ-OH)(µ-H2O)]nBrn·2nH2O 1 and [Cu2(trans-oxen)(µ-OCN)2]n·nH2O 2 [H2oxen = N,N′-bis(2-aminoethyl)oxamide] with zig-zag co-ordination chains were synthesized and characterized by single-crystal X-ray diffraction methods. The cationic chains [{Cu2(trans-oxe…
Dicarboxylic L-valyl-L-valine bolaamphiphiles produced nanoscale fibers with widths of 10–30 nm, via proton-triggered self-assembly in water, which are dominated by both intralayer, lateral hydrogen-bond networks between end carboxylic acid groups and parallel β-sheet networks between amide groups.
Strictly linear amyloses have been heated in a sealed ampoule in the presence of salicylic acid (SA). When using an amylose of molecular weight 1310000 (AS-1310), two types of inclusion complexes, differing in helix structure, were formed, depending on the amount of SA. With 10% SA a complex with 71-helix structure wa…
A physical modelling investigation has been undertaken to determine the relationship between the physico-chemical properties of the liquid phase, the gas bubble size, the gas flux, and the residence times of gas in spherical foams. The testwork was conducted in a 107 mm diameter glass column in a temperature controlle…
Electrochemical interconversion between 9,9,10,10-tetraaryldihydrophenanthrene 1 and 2,2′-bis(triarylmethylium) 22+ has been proven to proceed via open form cation radical 2+· as a stable intermediate; using these three species, a novel tricolor electrochromic system that exhibits hysteretic color change (color 1 → co…
We have studied chiral induction in a nematic in contact with a chiral surface using computer simulations. Nematic and surface particles have been modelled using the Gay–Berne (GB) potential considering, additionally, a short-range chiral term for the inducing surface. We find that, close to the chiral surface, a twis…
We propose a generalisation of the Mullins–Sekerka problem to model phase separation in multi-component systems. The model includes equilibrium equations in bulk, the Gibbs–Thomson relation on the interfaces, Young's law at triple junctions, together with a dynamic law of Stefan type. Using formal asymptotic expansion…
The scope of carboxylate binding by tin(IV) porphyrins and the solution geometries of the resulting complexes have been explored using 1H NMR spectroscopy; ring current induced shifts and competition experiments indicate the operation of an attractive anthracene–porphyrin interaction; outer sphere carboxylic acid comp…
The synthesis of a discotic side group liquid crystal polymer based on poly(methyl methacrylate) is reported. This involves the oxidative coupling of 3,3′,4,4′-tetrakis(hexyloxy)biphenyl with 1-hexyloxy-2-methoxybenzene to yield the unsymmetrical triphenylene nucleus, 2-methoxy-3,6,7,10,11-pentakis(hexyloxy)triphenyle…
Description Features the most current research on design procedures and flowable fill applications, as well as five ASTM standards on CLSM. 26 peer-reviewed papers cover a wide range of new developments in the field, including: Ingredients -- Fly ash and aggregates including recycled glass are explored in four papers.…
The occurrence of dynamic recrystallization in ferritic iron, which is a typical dynamic recovery-type material, was confirmed in the present study using a Ti-added interstitial-free (IF) steel. The specimens were hot-compressed at various strain rates at various temperatures within the ferritic region and quenched im…
Mesoporous silicates synthesized in strongly basic media from sodium silicate in the presence of cetyltrimethylammonium chloride, a cationic surfactant. The formation of a lamellar phase and its transformation into hexagonal MCM-41 were studied by powder X-ray diffraction (XRD), 29Si magic-angle-spinning (MAS) NMR and…