Materials Literature
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Porous Fe–Al alloys with the nominal composition ranging from Fe–20 wt-%Al to Fe–60 wt-%Al have been fabricated by Fe and Al elemental powder reactive synthesis. The effects of the Al content on the pore properties of resultant porous Fe–Al alloys were systematically studied. It has been found that the volume expansio…
An in-depth analysis of lossless reciprocal periodic structures of transmission lines (TLs) is presented. Interestingly, it is found that periodic structures can provide both non-negative (NNCR) and negative characteristic resistances (NCR). In addition, the magnitude of the voltage reflection coefficient associated w…
A Comment on the Letter by G. Chen et al., Phys. Rev. Lett. 101, 195502 (2008). The authors of the Letter offer a Reply.Received 28 January 2009Corrected 19 May 2009DOI:https://doi.org/10.1103/PhysRevLett.102.209601©2009 American Physical Society
Interface modification by inserting an ultrathin low-temperature GaN layer prior to the growth of high-temperature GaN barriers followed by an annealing process was employed to improve the properties of the InGaN/GaN quantum wells. By detailed studies and comparisons of the surface morphology, photoluminescence and th…
The success of a biocompatible vascular graft depends upon its mechanical attributes and post-implantation healing responses. Mechanical strength is a paramount issue because grafts placed in the arterial circulation must be capable of withstanding long-term haemodynamic stress without graft failure. Extracellular mat…
High-purity olivary-shaped carbon particles with a diameter of ∼1.5 μm at the middle and a length of ∼3 μm were synthesized by the thermolysis [700 °C] of olive oil under its autogenic pressure in a closed reactor. We employed in situ mass spectrometry to monitor the volatile gases responsible for the autogenic pressu…
A “hybrid” structure based on organic (p-type) and inorganic (n-type) single crystalline nanoribbons was introduced for the fabrication of organic bipolar field-effect transistors and inverters. The devices were fabricated based on individual organic single crystalline nanoribbon of copper phthalocyanine as p-channel…
The acyl-AMP forming family of adenylating enzymes catalyze two-step reactions to activate a carboxylate with the chemical energy derived from ATP hydrolysis. X-ray crystal structures have been determined for multiple members of this family and, together with biochemical studies, provide insights into the active site…
High-quality CeO2 films were grown on Al2O3(0001) substrates using oxygen plasma-assisted molecular beam epitaxy. The epitaxial orientation of the films is found to be CeO2(100) and CeO2(111) at low (<8 Å/min) and higher growth rates (>12 Å/min), respectively. CeO2(100) film grows as three-dimensional islands, while C…
Compositional graded and highly relaxed Si1−xGex layers have been fabricated by using thermal oxidation at high temperature. It was found that the behavior of Ge atoms during thermal oxidation was significantly dependent of the oxidation temperature. The Ge accumulation below the oxide occurred at 800 and 900 °C due t…
Complexes of the type MLL′ · nB (where M = Ni(II) and Cu(II); LH and L′H = 2,4-pentanedione (acacH), 1-phenyl-1,3-butanedione (bacH), and 1,3-diphenyl-1,3-propanedione (dbmH); n = 0 to 2 and B = water or pyridine) have been synthesized and characterized. IR spectra are consistent with uninegative bidentate ligands. Ma…
We have studied the nucleation and growth of Se-Te nanowires (NWs), with different morphologies, grown by a chemical solution process. Through systematic characterization of the Se-Te NW morphology as a function of the Te nanocrystallines (NCs) precursor, the relative ratio between Se and Te, and the growth time, a nu…
Removal of the functional groups of guanine, i.e. ketone and amino, one by one produces model molecules of hypoxanthine, 2-aminopurine and unsubstituted purine. The impact of the ketone and amino moieties on guanine is revealed using their atomic-site-based inner-shell electronic properties and spectra. A density func…
A novel method for fabricating tin nanoparticle thin film electrodes that show good performance in lithium ion batteries during cycling is reported. The vacuum filtration method has the advantage of affording a high degree of dispersion of the electrode components, thereby providing good electrical contacts between th…
Room temperature ionic liquids were found to be a kind of versatile lubricant with excellent friction reduction, antiwear performance. However, our knowledge is insufficient for understanding their corrosive properties. In the present work, the effects of a series of 1-n-alkyl-3-methylimidazolium hexafluorophosphates…
Two helical samples: F-actin and the bacteriophage T4 tail sheath were reconstructed in three dimensions from contrast enhanced (rotational shadowing and negatively stained) in-lens cryo-field emission scanning electron micrographs, using the iterative real-space helical reconstruction method. The F-actin--and bacteri…
The scintillation yield, scintillation decay, and x-ray excited emission of pure LaCl(3) was studied as a function of temperature between 80 and 600 K. Two broad band emissions centered around 325 nm and 400 nm were identified and correlated to emissions from two localized exciton states named STE(1) and STE(2), respe…
Lower rim O-methyl, -n-butyl, and n-octadecyl calix[4]arenes bearing p-phosphonic acid groups on the upper rim have been prepared in high yield, compounds 12-14. Where possible the compounds have been characterized in the solid state using X-ray diffraction, or as the precursor phosphate esters or a cesium salt. The c…
Abstract A novel ultrasonic welding technique is proposed and the apparatus based on it is produced accordingly. The effects of weld technology on the strength have been discussed when evaluating with identical kind of polymers. According to the results, the protruded length and the surface roughness give poor effects…
The thermo-responsivity of PNIPAAm [poly(N-isopropylcarylamide)]-grafted PDMS [poly(dimethylsiloxane)] surface is a property that could be feasibly used for detaching cells adhered on the surface. We used benzophenone-initiated photopolymerization to graft PNIPAAm on PDMS substrates to construct the PNIPAAm-grafted PD…