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This paper presents the potential use of a robotic end-effector for acquiring single plies from a stack of fabrics. This type of end-effector would be required to integrate robots into present-day garment manufacturing operations. Two design concepts, pins and temporary adhesion, were shown experimentally to successfu…
Measurements of magnetization, susceptibility, thermal expansion and electrical resistivity have been carried out on the RMn 2 compounds with R=Gd, Tb, Dy, Ho and Er. Magnetization measurements were made on the single crystals for all the compounds. A simple ferrimagnetic structure is observed at 4.2 K for GdMn 2 , Ho…
The core structure of edge dislocations produced during the prismatic slip mode in α-titanium has been determined by high resolution electron microscopy. The core was extended in the prismatic plane with a width equal to 12 Å. Irrespective of the exact dissocation scheme, this gives a stacking fault energy close to 15…
Abstract The viscosities of mixtures of low‐density polyethylene and fluorocarbon blowing agent were determined from the measurement of wall normal stress along the longitudinal axis of a capillary die. For the study, three different grades of commercial high‐pressure low‐density polyethylene were used, together with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive polymers. 5. Reversible solubility change of polystyrene having azobenzene pendant groupsMasahiro Irie and Hisami TanakaCite this: Macromolecules 1983, 16, 2, 210–214Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of poly(ethylenimine). 3. Structural characterization of anhydrous and hydrous states and crystal structure of the hemihydrateYozo Chatani, Takushi Kobatake, and Hiroyuki TadokoroCite this: Macromolecules 1983, 16, 2, 199–204Publication Date (Print):Februa…
The proton spin-lattice relaxation times (${T}_{1}$) and Knight shifts (${\ensuremath{\sigma}}_{K}$) have been measured as a function of temperature in fcc ($\ensuremath{\delta}$ phase) and fct ($\ensuremath{\epsilon}$ phase) $\mathrm{Zr}{\mathrm{H}}_{x}$ for hydrogen concentrations $1.5\ensuremath{\le}x\ensuremath{\l…
Abstract By use of the Clapeyron equation for the dependence of the melting point on pressure, the heat of fusion was found to be 32.5 cal/g, in good agreement with values determined by other methods. An equation for the dependence of the melting point on the degree of polymerization gave a heat of fusion of 27.6 cal/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of aquatic humus with diethylaminoethylcelluloseCarl J. Miles, John R. Tuschall, and Patrick L. BrezonikCite this: Anal. Chem. 1983, 55, 2, 410–411Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue 1 February 19…
Abstract The value of t max in differential scanning calorimetry is correlated with the crystallization kinetics of poly(ethylene terephthalate) (PET). The Avrami exponent, n , obtained varies as a result of a change in slope of the curve at the point t n , a secondary crystallization transition. The plot of t n vs. t…
The aggregations of protoporphyrin IX and haematoporphyrin IX in aqueous solutions were studied by fluorimetric techniques. Porphyrin concentrations were limited to 0.001-0.1 microM and 0.01-1 microM for protoporphyrin and haematoporphyrin respectively, where dimerization is the dominant aggregation process. The dimer…
Application of indentation fracture analysis to Knoop and Vickers indentation is examined, with particular emphasis on determining the limitations of the point force representation for the residual stress field. Deviation from the point force approximation is insignificant for crack‐size/plastic‐zone‐size ratios 1.3.…
SUMMARY. Methods for determination of low levels of biogenic silica (0.2–0.4 mg SiO 2 ) in aqueous samples after digestion with three wetalkaline extraction procedures compared favourably in both precision of replicates and recovery of silica utilized by diatoms in budgeted cultures. Leaching samples with 0.2 M NaOH f…
Continuous phase transitions were found to occur in ZrTiO 4 above and below a major discontinuity at 1125°±10°C. The space group of both forms of ZrTiO 4 is Pcnb. For specimens quenched from high temperatures, the volume of the unit cell decreases linearly from ∼1450°C to the discontinuity, with the major change occur…
Kinetic experiments involving the homogenization of fine-scale, coherent (001) pigeonite lamellae in a sub-calcic diopside have been used to constrain Ca-Mg interdifusion coefficients for clinopyroxenes. At 1150'-1250'c and 25 kbar, average Ca-Mg effective binary interdiffusion coefficients are described by D : (f .SS…
A numerical model has been developed for predicting the two-dimensional flow and temperature fields in a hybrid plasma which is characterized by the superposition of an rf plasma and an arc jet. Calculations have been made for the confirmation of a prominent feature of the hybrid plasma. As might be expected, the deri…
We have carried out a detailed study of the smectic-$A$-smectic-$C$ transition in butyloxybenzylidene heptylaniline (40.7) using high-resolution x-ray, heat-capacity, and light scattering techniques. Although the order-parameter data are consistent with heliumlike critical behavior, the data as a whole are uniquely de…
The regional distribution of phosphoproteins whose phosphorylation is regulated either by cyclic AMP or by calcium in combination with calmodulin or phospholipid has been investigated in particulate preparations from rat CNS. About 30 distinct phosphoproteins were observed. These phosphoproteins exhibited widely diffe…
Abstract Linearly segmented polyurethanes and polyurethaneureas are known to be phase separated; one phase is the soft phase, the other, the hard domain. Quantitative evaluation of the degree of phase separation was obtained by DSC. An estimation of the dispersed soft segments outside the soft phase can be made by Δ C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis and dilute solution properties of 12- and 18-arm-star polystyrenesJ. Roovers, Nikos Hadjichristidis, and Lewis J. FettersCite this: Macromolecules 1983, 16, 2, 214–220Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published in…