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。
This paper introduces the concept of JetRing spinning, a new spinning technique that incorporates features of both ring and air-jet spinning systems. In JetRing spinning, a single air jet is used below the yarn-forming zone of a conventional ring spinning system; this jet acts in a way similar to the first jet in air-…
The isothermal isotopic exchange reaction of 18 O 2 with 16 O of chromium(VI) oxide supported on zirconia, alumina, and titania has been investigated with in situ laser Raman spectroscopy. The isotopic exchange reaction is dependent on the support type, the Cr loading, and the reaction temperature. Complete isotopic e…
The complexation of poly(styrene- co -vinylphenol) (STVPh) and poly(styrene- co -vinylpyridine) (STVPy) in nonaqueous solution was investigated with emphasis on the effect of the hydroxyl and pyridyl contents in the component polymers. Viscometry, nonradiative energy transfer fluorospectroscopy, and dynamic laser ligh…
The influence of N‐heterocyclics, viz. imidazole (IA), benzimidazole (BIA) and 2‐methyl imidazole (MIA) on the corrosion and hydrogen permeation through mild steel in 1 N H 2 SO 4 and in 1N HC1 has been studied using weight loss and various corrosion monitoring techniques. Imidazole and benzimidazole inhibit the corro…
The paper introduces a new physical approach to account for the effect of reduced air density on the flashover voltage and critical leakage current of polluted high voltage insulators. The analysis starts by updating the mathematical model, previously established, of power frequency flashover of polluted insulators at…
Homopolymers of 1,4,8-trioxa[4.6]spiro-9-undecanone (TOSUO) and block copolymers of TOSUO and ε-caprolactone (ε-CL) have been synthesized with aluminum isopropoxide as an initiator in toluene at 25 °C. The homopolymerization is first order with respect to both monomer and initiator, and the end-group analysis agrees w…
The absorption and conduction currents in synthetic insulating polymers, viz., polyethylene, polypropylene, polyethylene-terephthalate and polyvinylidenefluoride, with dc fields may be electronic or ionic both and it may be difficult to determine their origins unambiguously. The charges which are present in the bulk o…
A theory has been developed to calculate microstreaming velocity inside and outside an isolated air bubble in a liquid produced by a bubble-scattered sound field, taking account of two predominant modes of the bubble’s motion: a monopole (pulsation), and a dipole (translational harmonic vibrations). It has been demons…
This paper describes the design of shape memory alloy force and displacement actuators based upon the thermomechanical constitutive relations previously developed by the authors. Numerical simulations and design case studies are presented which show the utility and advantages of this method over design methods current…
Observed and simulated electrochemical noise (EN) from general and localized corrosion on uncoated metals was used to test theoretical concepts regarding the relation of electrode area and corrosion rate to noise. Electrode area influences noise resistance, which emphasized the importance of the choice of electrode ar…
Raman microprobe analysis of Nicalon NLM 202 and Hi-Nicalon fibres as a function of thermal treatments in various atmospheres was carried out in order to understand the fibre evolution during the synthesis of composites and their use in combustion environments. Assignments are discussed and a description of the fibre…
This paper describes the time evolution of bubbles generated by underwater electrical discharges. The oscillations of these high-temperature vapor and plasma bubbles generate acoustic signatures similar to the signatures generated by air guns, underwater explosions, and combustible sources. A set of model equations is…
The structure and composition of passive films electrochemically formed on Ni‐Cr alloys in 1 M NaOH and 0.5 M has been studied with x‐ray photoelectron spectroscopy. The passivation potential was varied within the passive range up to the transpassive range and the time of passivation from 10 ms to 1000 s. With angular…
Pitting corrosion of stainless steel has been extensively studied by electrochemical impedance spectroscopy (EIS). However, the frequency dependence of the current distribution is much different in the vicinity of a pit than on the passivated part of the surface. Therefore a localized electrochemical impedance techniq…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Characterization of Photo-Cross-Linked Polymers Based on Poly(l-lactic acid-co-l-aspartic acid)Jennifer Elisseeff, Kristi Anseth, Robert Langer, and Jeffrey S. HrkachView Author Information Harvard−MIT Division of Health Sciences and Technology, Cambridge, Massach…
A topology-based and duality-derived three-phase, three-winding, core-type transformer model is presented. The model treats the leakage inductances and the coupling effects of the core in a straightforward and integrated way. The long-established positive- and zero-sequence star equivalent circuits of a three-phase th…
Mathematical models were developed to predict cathodic protection (CP) requirements for coated pipelines protected by parallel anodes. This work was motivated by the need to estimate current and potential distribution on a pipe when anodes are placed nearby or when discrete coating holidays expose bare steel. The math…
Crystallization and growth of an isolated extended chain single crystal (ECSC) of polyethylene (PE) under high pressure from the melt into the mobile phase, such as hexagonal phase, was studied by in-situ optical microscopy and transmission electron microscopy. Direct evidence is obtained that an isolated ECSC was for…
Other| April 01, 1997 Phase relations among smectite, R1 illite-smectite, and illite Hailiang Dong; Hailiang Dong University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States Search for other works by this author on: GSW Google Scholar Donald R. Peacor; Donald R. Peacor Search for other work…
In the present study a comprehensive mathematical model is developed to simulate the dynamic behavior of industrial poly(vinyl chloride) (PVC) batch suspension polymerization reactors. More specifically, the model predicts the monomer concentration in the gas, aqueous, and polymer phases, the overall monomer conversio…