Materials Literature
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Algal floristic work carried out in Iran between 1853 and 1981 have been reviewed and compared with the results obtained in a series of recent studies (2000-2007). Algal samples for the recent studies were collected mainly from different inland aquatic habitats. On the basis of data from published and the recent studi…
The process of synthesis of granular low-modulus zeolites from a mixture of metakaolin and solid sodium hydroxide depending on the method of pre-treatment (mechanochemical activation or ultrasonic treatment) has been investigated. The vibration roller-ring mill VM-4 (vibration frequency 930 min–1) was used for mechano…
Ternary amorphous or/and nanocrystalline Zr-(12–18)Cr–W alloys were successfullyprepared by direct current (DC) magnetron sputtering. The corrosion rates of Zr-(12-18)Cr-W alloys are in the range of 1-2 x 10-3 mm/y which are even lower than those of thesputter-deposited binary W-Zr and W-Cr alloys, and are nearly one…
The quality of UO 2 single crystals grown by arc‐melting, by a modified floating‐zone technique (ICZG), and by vapor deposition was studied using etch‐pit patterns, electron microscopy, and X‐ray topography. These techniques complemented each other and indicated significant variations between the crystals grown by the…
Anodic oxidation of 99.99% aluminum sheets were conducted in solutions of several kinds of mono-carboxylic acids by applying d. c. of 1.87Amp/dm2. The concentrations of the solutions for baths were from 0.01mot/l to saturation and their temperature were from 20°C to boiling points.Porous and thick anodic oxide coating…
Abstract Crystals of NaI, KI, and KCl have been quenched from temperatures as high as 450 °C by rapid immersion in liquid nitrogen. In the case of NaI, very strong absorption bands at 255 nm (Q 1 ) and 226 nm (Q 2 ) may be produced by quenching the crystal from about 360 °C. The excitation spectrum for a characteristi…
Abstract. Bonde S. 2011. A biogenic approach for green synthesis of silver nanoparticles using extract of Foeniculum vulgare and its activity against Staphylococcus aureus and Escherichia coli. Nusantara Bioscience 3: 59-63. We report green synthesis of silver nanoparticles from extract of Foeniculum vulgare (fennel,…
Sulphonated jute fibres were blended with cotton at three different ratios, e g. 50:50, 60:40 and 70:30 for production of fine yarn and comparatively better ratio have been investigated. The plain woven fabric were prepared by sulphonated jute-cotton yarn. The set of warp and weft blended yarns was done on the one up…
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La Laguna de Los Pozuelos se ubica al noroeste de la provincia de Jujuy (Argentina) a 3625 msnm. Fue designada Monumento Natural Nacional y Humedal de Importancia Internacional (Convención RAMSAR). Este trabajo tuvo como objetivo analizar las variaciones espacio-temporales de la flora de diatomeas y su relación con va…
Use of natural fiber as reinforcing material is the latest invention of polymer science in order to get higher strength with lower weight composite materials having several applications. In this present investigation banana fiber, a natural fiber, is used as the reinforcing material. Low density polyethylene (LDPE)-ba…
The present study reveals the comparison of physical properties of the bamboo/cotton blended yarn with similar 100 % cotton yarn. The bamboo-cotton blend ratios of each category of yarn (30s, 40s and 50s) were 67:33, 50:50, and 33:67, respectively. For each individual count of yarn, it was observed from the test resul…
Naproxen, an anti-inflammatory drug, exhibits poor water solubility and flow properties. Spherical agglomerates were prepared by solvent change method. Solvent composition for spherical agglomeration was determined by constructing ternary diagram. Crystallization medium used for spherical agglomerates of naproxen cons…
温度範囲160～900℃で熱前処理した3種のシリカゲル粉末をメタノール中に浸潰し,オートクレープを用いてISO,200および250℃で0～92時間加熱した。このメタノール処理で溶解したシリカの量をケイモリプデン酸法で測定し,またこの処理によるシリカゲル表面の変化をメチルレッド吸着,含有炭素の定量,赤外吸収および示差熱分析の諸法によって追跡した。処理後シリカゲルの表面にメトキシル基が形成され,表面の水酸基は900℃で熱前処理したもののほかは,いずれもいちじるしく減少した。 500℃で熱前処理したシリカゲルが溶解量,エステル化度ともに最高を示した。メタノール処理のごく初期の段階ではエステル化は急速に進み,溶解は徐々に進行した。その段階…
Measurements of the linear coefficient of thermal expansion, Young’s modulus and its mean temperature coefficient, and density were carried out at elevated temperatures so as to investigate the variation in the Elinvar property of nickel at high temperature with the addition of palladium and platinum. It has been made…
The study was made in a static mercury-free, system using a low-pressure mercury arc. At 25°C the major gaseous product is ethane; some methane is formed with traces of other hydrocarbons. Solid polymer and metallic tin deposit on the cell window. The decomposition increases with temperature and at 150°C several other…
Electron beam experiments on SnO2show that it is an indirect transition semiconductor with an energy gap of approximately 2.6 eV. Spectral and output intensity curves are presented. These indicate a very broad wavelength emission and no gain in the material.
The crystal structure of the colourless nitrosobenzene dimer shows a cis-arrangement of the two nitroso-groups and an unexpected, slight non-planarity of the central (CNO)2 group.
Pyridine is photosubstituted by cyclohexane and gives 2- and 4-cyclohexylpyridine by a radical mechanism: 2- and 4-picoline lead to the same compounds —4- and 6-cyclohexyl-2-picoline, indicating that the two picolines react through the same intermediate.
Abstract In order to explain the origin of strain‐enhanced diffusion in α‐iron, the concentration of excess vacancies generated by non‐conservative motion of jogs on screw dislocations during creep deformation was estimated under various creep conditions. In the estimation the values of activation volume for high temp…