Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Reduced no-load losses have resulted in increased susceptibility to ferroresonance of grounded wye-wye three-phase distribution transformers using five-leg silicon steel wound cores. The authors describe the results of an extensive test program which determined that overvoltages are directly related to the ratio of ca…
Abstract To better understand fabrics in dolomitized carbonates, aragonitic ooids were replaced with dolomite in laboratory experiments. Recent ooids from Cat Cay were reacted in a solution of 0.5 M MgCl 2 and 0.4 M CaCl 2 in Teflon-lined stainless steel bombs at 200 degrees C and equilibrium vapor pressure. X-ray dif…
α‐C 2 SH can be synthesized by hydrothermal treatment of lime and silicic acid for 2 h at 200°C. When heated to 390–490°C, α‐C 2 SH dissociates through a two‐step process to form an intermediate phase plus some γ‐C 2 S. This appears to be a new dicalcium silicate different from known dicalcium silicates—α, α′ L , α′ H…
Abstract The linear electro‐optic (Pockels) effect in a series of alkali metal acid phthalate crystals has been studied. Single electro‐optic coefficients r and r for sodium (NaAP), potassium (KAP) and rubidium (RbAP) acid phthalates have been measured by employing the modified Mach–Zehnder interferometric technique.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAminosilanes in organic synthesis. Preparation of new expanded porphyrin ligands and bimetallic transition-metal complexes. Crystal structure of a tetrapyrrole macrocycle dirhodium complexF. H. Carre, R. J. P. Corriu, Geng Bolin, J. J. E. Moreau, and C. VernhetCite this: Org…
The combined results of the present investigation of Nylon 5 and Nylon 9 and the previous investigation of Nylon 11 and Nylon 7 reveal that the odd-numbered nylons exhibit classic ferroelectric J-E and D-E hysteresis behavior at room temperature. In addition, the remanent polarization, P r, of Nylon 5 and Nylon 9 is f…
Abstract The reaction of [2.2]paracyclophane ( 1 ) with liquid bromine affords a 1:1 mixture of only two isomeric products, the pseudo‐para 2 and pseudo‐ortho tetrabromide 3 . The structure of the pseudo‐para isomer 2 has been determined by X‐ray structure analysis. Fourfold palladium‐catalyzed coupling with styrenes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexaalkoxytricycloquinazolines: new discotic liquid crystalsSandeep Kumar, Ellen J. Wachtel, and Ehud KeinanCite this: J. Org. Chem. 1993, 58, 15, 3821–3827Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https:/…
One of the most effective methods of controlling emissions of volatile organic compounds (VOCs) is also one of the most economical--adsorption, usually using activated carbon as the adsorbent. This process is cost-effective because it is typically able to recover many VOCs for reuse. A particularly common application…
The traditional approach used in modeling of composites reinforced by three-dimensional (3-D) braids is to assume a simple unit cell geometry of a 3-D braided structure with known fiber volume fraction and orientation. In this article, we first ex amine 3-D braiding methods in the light of braid structures, followed b…
Abstract This review presents a general picture of suspension, dispersion, and interfacial polycondensation processes employed for the preparation of beaded resins, dry powders, and high solid dispersions. The polymer systems covered include polyamides, polyesters, polycarbonates, polyurethanes, and phenol‐formaldehyd…
In high nitrogen stainless steels and nitrogen surface-doped Mo-containing alloys, nitrogen has been shown to enhance passivity. The mechanism of this apparent Mo–N synergism appeared to be twofold. First, the formation of stable surface nitrides affects a reduction in active dissolution, and, second, reactions betwee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnexpected selectivity in the alkylation of polyazamacrocyclesWilliam J. Kruper Jr., Philip R. Rudolf, and Charles A. LanghoffCite this: J. Org. Chem. 1993, 58, 15, 3869–3876Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue…
The electrical properties of the ZnO varistors are demonstrated in this present study to be affected by the sintering temperature. The variation of the non-ohmic behavior with sintering temperature is indicated from I-V and C-V measurements to be a result of the changes of the interface defect density at the grain bou…
Perturbed-angular-correlation (PAC) spectroscopy was used to measure combined nuclear-magnetic-dipole and nuclear-electric-quadrupole interactions in rare-earth orthoferrite (REO) ceramics, R${\mathrm{FeO}}_{3}$ (R=La,Pr,Nd,...,Lu). The rare-earth orthoferrites are canted antiferromagnets that have orthorhombically di…
Abstract The morphology of the dispersed phase in immiscible polymer blends plays an important role in the determination of the final physical properties. This paper considers factors that influence the final state of deformation of the dispersed phase, and in particular, the formation of fibers and lamellae. Blends o…
A survey of the use of cyclo- and poly(phosphazenes) in fire resis tant applications is presented. Where appropriate, synthesis and commercial availability will be indicated. Two fundamentally different approaches, phosphazenes as additives or as intrinsically flame resistant materials, will be discussed. While the fo…
We present a theoretical approach for calculating the fields diffracted by gratings made of highlyconducting wires that have a rectangular shape. The fields between the wires are represented in terms of modal expansions that satisfy the approximated impedance boundary condition. Our results show thatthis procedure is…
The light protein components of silk fibroin were analyzed by Western blotting using polyclonal antibodies against two synthetic peptides that are segment of the light (L-) chain [Yamaguchi et al. (1989) J. Mol. Biol. 210, 127-139] and P25 [Chevillard et al. (1986) Sericologia 26, 435-449], respectively, and against t…
Although descriptions of the effect of stress on spontaneous magnetization within a single domain already exist, there remains no adequate mathematical model for the effects of noncoaxial magnetic field and stress on bulk magnetization in a multidomained specimen. This article addresses the problem and provides a phen…