Materials Literature
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We present a transistor-based microwave metamaterial exhibiting tunability over a wide range of time scales. By loading a metamaterial with a transistor, we show through theory and simulation that both the resonant frequency and quality factor of the metamaterial can be dynamically tuned with a voltage bias. We demons…
Abstract The retro‐Diels–Alder reaction has been used for the synthesis of an opp‐dibenzo[26]hexaphyrin and an opp‐dibenzo[28]hexaphyrin from the corresponding opp‐bis(bicyclo[2.2.2]octadiene)‐fused hexaphyrins. The opp‐dibenzo[26]hexaphyrin has a rectangular conformation regardless of solvent polarity, whereas the co…
Abstract Entgegen der üblichen Annahme aufgrund von Photozerstörungswegen durch höher angeregte Zustände zeigen wir, dass eine weitere Verbesserung der Photostabilität mit diffusionsbasierten Photostabilisierungsstrategieren möglich ist. Einzelmolekül‐Fluoreszenzspektroskopie offenbart, dass Thiolationen effektiv Trip…
Dawson heteropolyacid, H 6 [P 2 W 18 O 62 ], was chemically anchored to the amine-functionalized nanosilica surface in different loadings. The synthesized nanocomposite was characterized by FT-IR spectroscopy and N 2 adsorption experiments. The preservation of the structure of the Dawson and dispersion of the cluster…
The development of handheld signal cluster and 40-mm parachute green light–emitting pyrotechnic compositions is described. Of the new compositions evaluated, one was found to exceed the military requirements in burn time, luminous intensity, dominant wavelength, and spectral purity in both the cluster and parachute co…
In this paper, we introduce two subclasses H(\alpha; A;B) and K(\alpha; \mu; m; A;B) of the functions which are analytic in the open unit disk U and obtain coefficient bounds for these functions. References [1] Altintas O., On the coefficients of functions majorized by univalent functions. Hacettepe Bull. Nat. Sci. En…
The through thickness (interlaminar) shear strength and trans‐thickness tensile strength of three different nuclear‐grade SiC/SiC composites were evaluated at room temperature by the double‐notched shear and diametral compression tests, respectively. With increasing densification of the interlaminar matrix region, a t…
A new method for fast microstructure analysis of heavily deformed ferritic–pearlitic (F–P) steels has been developed based on X‐ray diffraction (XRD). The method provides information about residual stresses and microstructure defects occurring within the material volume and therefore allows reliable estimation of stre…
The damaged reticulation structure of SBS modifier was considered to be a main reason for the deterioration of pavement performances. The authors regenerated the damaged reticulation structure of aged SBS modified asphalt (SBS MA) by a gamma irradiation technology and assessed its potential applications. Changes of mo…
Spatial heterodyne interferometry (SHI) is a technique based on Fourier transform spectroscopy. As such, many of the benefits, such as high spectral resolving power, can be realized. Furthermore, unlike a Fourier transform spectrometer, an SHI is able to minimize the number of required samples for a given resolving po…
We report the synthesis of 2,4‐dialkyl‐3,4‐propylenedioxythiophene monomers with various alkyl chain length (n = 1, 2, 3, 4, 5) and their use for the surface modification by electropolymerization. Surprisingly, there is a drastic decrease in surface hydrophobicity as the alkyl chain length between n = 2 and 3 increase…
This chapter focuses on the electron density map of the small ribosomal subunit, shows features interpreted as ribosomal proteins and rRNA, and pinpoints secondary-structure elements. It highlights the use of heavy-atom markers for unbiased targeting of surface rRNA (e.g., the 3 end of the 16S RNA) and for the localiz…
A processing technique based on optical excitation of a polymer matrix nanocomposite containing a chemical precursor is presented to demonstrate the potential of this process for localized modification of nanoparticles in the bulk of the material. Femtosecond laser irradiation of a nanocomposite consisting of tungsten…
Abstract Differently substituted p‐cyanophenylsilanes, Me4−nSi(C6H4CN)n, (n=2, 3, 4), PhSi(C6H4CN)3, cycHexSi(C6H4CN)3 (cycHex=cyclohexyl), and MePhSi(C6H4CN)2, were prepared and fully characterized. Their coordination behavior was studied by utilizing silver salts of the type AgX (X=O3SCF3−, CO2CF3−), which led to co…
A surprising repeatable phenomenon regarding semiconductor ablation area changes has been discovered. Irradiated by femtosecond double pulses, the ablation area quasiperiodically oscillates as the pulse delay increases from 0 to 1 ps at a material-dependent fluence range. In contrast, the ablation area monotonically d…
Purpose – The purpose of this paper is to investigate the tribological properties of novel phosphorous-nitrogen (P-N) type additives in water. Design/methodology/approach – The tribological properties of the novel P-N additives in water are compared with a commercial lubricant additive of the P-N type using a four-bal…
Zn0.8Co0.2O epitaxial films have been grown by reactive magnetron sputtering and investigated with regard to the local structural properties, valence, and magnetism using x-ray absorption spectroscopy and both linear as well as magnetic circular dichroism. Samples were found to be phase pure and paramagnetic even at t…
Purpose – The purpose of the study was to find the best performance polymer material to be used in railway car bogies. Design/methodology/approach – Wear tests and optical and scanning electron microscopy were used. Findings – The friction coefficients of ultra-high-molecular-weight polyethylene (UHMWPE) and Nylon 6 p…
Bertram Hopkinson was prescient in writing of the importance of better measuring, albeit better understanding, the nature of high rate deformation of materials in general and, in particular, of the importance of heat in initiating detonation of explosives. This report deals with these subjects in terms of post-Hopkins…
This chapter compares and reviews the molecular adaptations shown by thermophilic and psychrophilic proteins. At both high and low temperatures, the proteins need to be active to maintain the cellular machinery in functional state. The proteins appear to achieve this by modulating their conformational stability/flexib…