Materials Literature
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Elastic properties, total formation energies and cell parameters of B-C structures \nare studied by molecular dynamics (MD) simulation. A well tested \nempirical Tersoff interatomic potentialfor simulation using a General Utility \nLattice program (GULP). The results are compared with the available experimental \nresu…
SrBi2Ta2O9 (SBT) thin films have been prepared on fused quartz substrates by using metalorgnic decomposition (MOD) method. X-ray diffraction (XRD) patterns show that films are polycrystalline in nature at annealing temperature of 750°C. The original optical energy band gap Eg obtained is about 4.57 eV. The changes of…
Decoctions prepared from the stembark and leaves of Ficus congensis, Fc (Engl) are used by the Southwestern Egun people of Nigeria in the management of„fevers“(translated in local language as iba) arising from infections. This has served as the driving impetus for the present investigational work on this plant. Hexane…
A bioassay-guided investigation of a Philippine specimen of the echinoderm Comanthus parvicirrus yielded ten compounds evenly divided into anthraquinones and naphthopyrones. Four of the five anthraquinones were identified as 1′-deoxyrhodoptilometrin ( 2 ) and rhodoptilometrin ( 3 ) along with their respective 6- O -su…
Onosma erecta is a Greek endemic plant belonging of Boraginaceae family. The methanolic extract of its aerial parts afforded after chromatographic separations simple hydroxylated compounds such as cis-3-(hydroxymethoxy)propenoic acid, 4-methyl-2-hydroxypentanone, both appearing for the first time as natural products,…
The lens constructed with slits perforated on the thin metallic film is designed by simulated annealing algorithm. And two demonstrates are carried out to validate the directional design algorithm. First, the lens with one focal spot is considered. After the width of each slit is obtained, the finite-difference time-d…
Metal magnetic memory is a novel NDT method that can be used to detect residual stress distribution of ferromagnetic components.Wavelet decomposition and entropy theory are used and wavelet singular entropy is introduced to extract characteristic from abnormal signals of defect. Furthermore, RBF neural network is util…
To understand the anti-inflammatory effect of lancemaside A isolated from Codonopsis lanceolata Trautv. (family Campanulaceae), which ameliorates TNBS-induced colitis [1], we orally administered lancemaside A to mice and performed its pharmacokinetic study in mice by LC-MS/MS. Orally administered lancemaside A was met…
Ten new triterpenoids, camphoratins A-J (1–10), along with twelve known compounds were isolated from the fruiting body of Taiwanofungus camphorates . Their structures were established by spectroscopic analysis and chemical methods. Compound 10 is the first example of a naturally occurring ergosteroid with an unusual 1…
Natural antioxidants have been one perspective for the prevention of photodamage and photo-aging that develops in consequence to ultraviolet light exposure [1]. Pothomorphe umbellata ( Pu ) water-ethanolic root extract showed antioxidant, photo-protective and metalloproteinases (MMPs) inhibitory activity, in part attr…
Based on Michelson interferometer principle and controlled via an elaborately designed computer program, the variation of interference order, which contains the information of refractive index and its variation, can be detected by an optical power meter and a CCD camera. According to the relation between the increment…
Glycyrrhizin is the main pharmacologically active component in licorice. It has a pleasant aromatic sweet taste and is commonly used as flavouring and sweetening agent in confectionery, beverages, chewing gums, and tobacco products. Long term consumption of higher amounts of glycyrrhizin results in serious side effect…
Enicostemma littorale Blume (Chota-Kirayat or Chota-Chirayata) is a glabrous perennial herb belongs to family Gentianaceae [1]. It is used as anti-diabetic, anti-inflammatory, anticancer and antioxidant [2, 3]. In the present study, a new, simple, sensitive, precise and robust high-performance thin layer chromatograph…
Abstract Fresh fracture surfaces formed by tensile failure of craze in molded polystyrene (PS) bars have been compared with the molded surfaces of the same bars, using an atomic force microscope with a thermal probe and operated in local thermal analysis. The results indicate that molecular weight is much higher in th…
Hoodia gordonii is a popular weight loss product highly susceptible to adulteration. This highlights the need for rapid and simple quality control methods for authentication of raw material and quantification of the perceived active ingredient, P57, a steroidal glycoside. High performance thin layer chromatography (HP…
The increasing number of plant species used in herbal medicinal products leads to misidentification, incorrect plant substitutions and adulterations. Nevertheless authenticated raw material is the basic starting point for the development of a botanical product. One example is the challenging differentiation between Pe…
Glasses with different Er3+-doped concentrations were fabricated, and J-O theory, F-L theory and MC theory have been used to calculate the spectral characteristics of Er3+ -doped glasses. The influences of Er3+ -doped concentration and the composition of matrix glass material on the physical properties and spectral pr…
We have investigated the electrodynamic properties of High-Tc strip-lines made by ion irradiation, in order to evaluate the potentialities of such a technology for RSFQ superconductor digital electronic. SQUID loops of different length and width have been fabricated by ion bombardment of 70 nm thick films through e-be…
In dieser Arbeit wird eine lasergestutzte Apparatur zur Messung des magnetischen Lineardichroismus in der Photoemission vorgestellt. Der Aufbau besteht aus einem Femtosekundenlasersystem, einer XUV-Laborquelle und einem UHV-Rezipienten fur die Photoemissionsspektroskopie an (magnetisierten) Festkorperoberflachen. Die…
Advances in the study of tribo-corrosion of materials in recent years have included the development of mechanistic maps, showing the transitions between the regimes as a function of the main process parameters. In such cases, maps have been constructed in both two and three dimensions. There are now a variety of model…