Materials Literature
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Cerium doped barium titanate is prepared by conventional ceramic method. The dielectric studies of Ba1-x Cex TiO3 have been accomplished at room temperature over a frequency range 75 KHz to 30 MHz for x = 0.1 to 0.4 with pure BaTiO3. The measurements of the real and imaginary part of dielectric constants show strong f…
Significant increases in tensile strength and slight decreases in ductility occur when titanium and titanium-base alloys are irradiated at 17 K to 1 to 10×1017 fast neutrons per square centimeter. The magnitude of the irradiation effect appears to depend on total alloy content and, over the fluence range investigated,…
A total of 97 phytoplanktonic algal taxa belonging to 17 genera under two classes (Euglenophyceae and Bacillariophyceae) have been recorded from a pond receiving effluents from two textile industries at Demra, Dhaka district. Five diatom species, namely Navicula cryptocephala Kütz., N. decussis Oestrup, N. rhynchoceph…
Abstract Mössbauer spectra of Ga t Fe 3− t O 4 ( t = 0.44) were taken at temperatures from 88 to 740 °K. The A‐ and B‐site Zeeman patterns are resolved. The B‐site pattern displays a variation of hyperfine field arising from a distribution of the non‐magnetic gallium ions in the A‐site. The spectra were analyzed by a…
Occurrence of blue-green algae in plain land, pond side, hilly area and dry rice field soils of Chittagong University Campus and N2 fixation of some of them have been studied. Twenty four species under 20 genera were identified and their number varied from 0.11Ã104/g to 2.8Ã104/g soil. Anabaena oryzae, Calothrix sp.…
Soybean oil is one of the major vegetable oils containing more than 99% of triglycerides of saturated and unsaturated fatty acids and has become an interesting source to produce bioplastic. This study investigates the synthesis and characterization of bioplastic developed by the acrylate epoxidized soybean oil through…
Powder mixtures of zirconium diboride and molybdenum disiliside were hot-pressed at the temperatures ranging from 1500° to 2200°C in graphite dies under the pressure of 200kg/cm2 in order to improve densifying and oxidation resistance properties. Pressure was applied through out the experiment and shrinkage of the com…
The equilibrium distribution coefficient of boron in germanium was found to be 12.2. The variation with growth rate was interpreted in terms of a theory by Burton, Prim, and Slichter. As the growth rate was increased the width of the diffusion dominated layer initially increased followed by a later decrease. This was…
Abstract The results of high strain‐rate tensile straining of a variety of elastomers at a number of temperatures are reported. Temperature increases, Δ T , occurring within the sample were measured during the deformation; i.e., the technique of adiabatic stretching was applied. The use of well characterized rubbers o…
The compound CsCrCl3 is antiferromagnetic, whereas the compounds M2CrCl4(M = NH4,K,Rb,Cs) are ferromagnetic and their dihydrates are normally paramagnetic.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical isomers of metaraminol. Synthesis and biological activityNoel F. Albertson, F. C. McKay, H. E. Lape, J. O. Hoppe, W. H. Selberis, and A. ArnoldCite this: J. Med. Chem. 1970, 13, 1, 132–134Publication Date (Print):January 1, 1970Publication History Published online1 M…
Impedance response of zinc and galvanized steel samples exposed in wet-dry cyclic condition using 0.05 M NaCl solution has been analyzed in order to evaluate their corrosion behavior. The wet-dry cyclic test was performed by exposing sample to alternate conditions of 1 h immersion in 0.05 M NaCl solution and 7 h dryin…
U.v.-irradiation of hexakis(trifluoromethyl)- and hexakis(pentafluoroethyl)-benzenes produces their valence-bond isomers. Hexakis(trifluoromethyl)benzene, in perfluoro-n-pentane solution, gives exclusively its benzvalene isomer with light of wavelength >270 nm.; with light of wavelength >200 nm., all three possible va…
In carbon nanotube (CNT) based composite, due to the small (micrometer) size of reinforcements a large amount of interphases is developed during the time of production. It is important to assess whether the interphase is responsible for the poor mechanical properties of CNT-reinforced composite. In this research, the…
Abstract It was the aim of this paper to study the influence of the solvent residues in PVC compounds on physical and mechanical properties of samples prepared from them as well as the rheologic properties of their melts. Besides tetrahydrofuran other solvents are also partly retained in PVC even after processing at h…
充てん剤系ゴムは単に充てん剤がゴムマトリックス中に分散した系ではなく, 複雑な高次構造を形成する. 本研究は充てん剤系ゴムの高次構造の各構造単位の形態, 分子運動性とマクロ的なゴムの力学的特性との間の関連性を, NR～ISAF, CaCO3, SiO2の各充てん剤系未加硫ゴムについて, NMR, 力学分散, DSCなどによるゴム分子鎖の運動面から検討した. その結果充てん剤の表面活性, その分散状態により充てん剤表面から離れた部分 (A相) のゴム分子鎖の運動は, それが活発に運動する状態では束縛を受けるが, この束縛された運動を見かけ上の非運動性のゴムの容積に変換することにより, E′, tanδの力学的数値をNMRより観測した…
A study of the photochemical reactions of some βγ-unsaturated and γδ-unsaturated 1,2-diketones is reported; it is concluded that the only efficient primary intramolecular processes involve the carbonyl group furthest removed from the alkyl chain, which may undergo cycloaddition via a five-membered transition state to…
Abstract : Hot pressed diboride compositions of ZrB2 or HfB2 with additions of SiC and/or C were employed to produce materials with a range of compositions and microstructural variations of porosity and grain size for mechanical property evaluations which included ben strength and elastic modulus from room temperature…
The Specific Rotation of Sorbitol and of the Sorbitol Molybdate Complex. The specific rotation of the hexite at 365, 405, 436, 546 and 578 nm has been determined in solutions of different concentration with a commercial sorbitol preparation as well as with a self‐produced sorbitol. Contents of both preparations had be…
Uniaxial fatigue properties from tests at 400, 500, 600, and 700 C on Type 304, 304L (Ti modified), and 316 stainless steel specimens irradiated at 450 C in sodium and 750 C in argon at fluences of 0.03 to 9.3×1021 n/cm2, E>0.1 MeV, are given and compared with control specimens. Material was tested in the annea…