substituted naphthofurans and naphthopyrans were constructed at high temperature from allyl or propargyl naphthyl ethers via claisen rearrangement in moderate to good yields. also, substituted (trimethylsilyl)-naphthofurans were synthesized from the corresponding naphtofurans.

hydatid cyst fluid has been used as a source of antigen for the serodiagnosis of echinococcus granulosus infection. due to cross-reactions with antigens shared by other helminthes, the specific antigen from hydatid cyst fluid was purified by many workers. we used a relatively simple technique for purification of specific antigen from sheep hydatid cyst fluid. isopycnic ultracentrifugation with ...

one of the most ambiguous historical periods in iran is median era so that the median architecture has a lot of unknown aspects. noshijan hill in malayer city is one of the foremost historical zones of media where its main settlement includes a time period ranged from 750 to 650 bc. this zone has been explored by a british team headed by dr. david stronach; as a result, some of valuable constru...

several 2-ketomethylquinolines were synthesized by heating, 2-methyl quinoline with acyl chloride in the presence of alcl3 contrary to reported procedures, this method was accomplished at a short time obtaining good results.

breast cancer is the second largest cause of cancer deaths among women. at the same time, it is also among the most curable cancer types if it can be diagnosed early. this paper presents a novel hybrid intelligent method for recognition of breast cancer tumors. the proposed method includes three main modules: the feature extraction module, the classifier module and the optimization module. in t...

we design a two-stage scheme to consider trajectory planning problem of two mobile manipulators for cooperative transportation of a rigid body in presence of static obstacles. within the first stage, regarding the static obstacles we develop a method that searches the workspace for the shortest possible path between start and goal configurations by constructing a graph on a portion of the confi...

the susceptibility to terbacil of six randomly selected strawberry cultivars (‘aromas’, ‘chambly’, ‘harmonie’, ‘kent’, ‘la clé des champs’ and ‘seascape’) was analysed using chlorophyll florescence (cf) in comparison with visual observation, in an attempt to develop a method for use in a breeding programme to select herbicide-resistant strawberry lines. terbacil was applied at one of five rates...

We consider optimal hedging decisions for a firm whose stock returns are affected by market returns and an idiosyncratic factor that is orthogonal to the market return. We show that the level of firm’s cash flows depend on the level of the market and the level of the idiosyncratic factor multiplicatively because of compounding. Minimizing the variance of the cash flow requires a substantial off...

In concrete structures such as road facilities, harbor facilities, sediment control dams, and others, impact loads sometimes act directly on members. Load bearing capacity, toughness and displacement recovery properties are important, and should be evaluated appropriately. Recently, to prevent the spalling of concrete portions is also one of the important requirements for concrete structures. T...

The structural properties and activities of Cu-Co catalysts used in Fischer-Tropsch synthesis are explored according to their method of preparation. Impregnation, co-precipitation, and a novel method of thermal decomposition were applied to an inorganic precursor complex to generate the Cu-promoted alumina- and silica-supported cobalt catalysts. The precursors and the catalysts obtained by ...