Crimping analysis of textured polyester multifilament yarn

The properties of textured POY PES multifilament yarns are conditioned by texturing temperature, texturing speed, stretching degree and by the ratio of disc peripheral speed and yarn speed. In the paper attention is focused on crimping of yarns. New method for defining crimping limits is proposed. The method is based on the flow analysis of the force-elongation function. POY multifilament polyester yarns, having the fineness of 167f36x1 dtex were analyzed. The texturing of PES multifilament yarns was performed using different first heater temperatures (350 oC, 400 oC, 450 oC) and maintaining the constant temperature of the second heater (180 oC), then with different texturing speeds (500 m/min, 600 m/min, 700 m/min, 900 m/min, 1000 m/min, 1100 m/min), using different ratio of the disc circumferential speed to yarn speed (2.15, 2.20, 2.25) and at the extension degree of 1.665.

Download Full-text

Stepwise injection analysis as a new method of flow analysis

Journal of Analytical Chemistry ◽

10.1134/s1061934807050152 ◽

2007 ◽

Vol 62 (5) ◽

pp. 475-478 ◽

Cited By ~ 14

Author(s):

A. V. Mozzhukhin ◽

A. L. Moskvin ◽

L. N. Moskvin

Keyword(s):

Flow Analysis ◽

New Method ◽

Stepwise Injection Analysis

Download Full-text

New continuous-flow analysis for simultaneous determination of creatinine and uric acid in 200 microliters of serum without use of a dialyzer.

Clinical Chemistry ◽

10.1093/clinchem/24.9.1578 ◽

1978 ◽

Vol 24 (9) ◽

pp. 1578-1585 ◽

Cited By ~ 3

Author(s):

P H Lolekha ◽

V Chantarothipol ◽

A Wongvibulsin

Keyword(s):

Uric Acid ◽

Steady State ◽

Continuous Flow ◽

Total Bilirubin ◽

Sodium Dodecyl ◽

Flow Analysis ◽

New Method ◽

Continuous Flow Analysis ◽

Instrument Response

Abstract We present a new method for direct continuous-flow (AutoAnalyzer II) measurement of serum creatinine and uric acid. The manifold is simple, inexpensive, and can be constructed in the laboratory. Only 200 microliters of serum is needed; analysis rate is 60 samples per hour. The incorporation of sodium dodecyl sulfate and the simultaneous provision of blank subtraction make it possible to omit the dialysis step. Our method does not require the linearizer, since instrument response and concentration of creatinine and uric acid are linearly related to 200 and 120 mg/liter, respectively. The percentages of steady state, interaction, and recovery are acceptable, Precision is excellent and the results obtained from the new method correlate well with those obtained by the comparison methods. Interferences are few and, when encountered, are generally smaller than in the modified Technicon method. Marked hemolysis interferes only with the uric acid assay; marked turbidity has no effect on results for creatinine. Icteric serum with total bilirubin of 50 and 100 mg/liter interferes significantly with results for creatinine and uric acid, respectively, by the new method.

Download Full-text

A NEW METHOD FOR PREDICTING GROUND SETTLEMENT USING GROUNDWATER FLOW ANALYSIS

Doboku Gakkai Ronbunshu ◽

10.2208/jscej.2005.799_1 ◽

2005 ◽

pp. 1-12

Author(s):

Makoto NISHIGAKI ◽

Toshikazu IMAI ◽

Mitsuru KOMATSU ◽

Izumi NAGAI

Keyword(s):

Groundwater Flow ◽

Flow Analysis ◽

New Method ◽

Ground Settlement

Download Full-text

Parameterizable constant temperature anemometer: a new method for the analysis of velocity–temperature coupling in turbulent heat transfer

Measurement Science and Technology ◽

10.1088/0957-0233/21/7/075401 ◽

2010 ◽

Vol 21 (7) ◽

pp. 075401 ◽

Cited By ~ 5

Author(s):

M Ndoye ◽

J Delville ◽

D Heitz ◽

G Arroyo

Keyword(s):

Heat Transfer ◽

Constant Temperature ◽

New Method ◽

Turbulent Heat Transfer ◽

Turbulent Heat ◽

Constant Temperature Anemometer

Download Full-text

Studies on nucleation from solution of some soluble inorganic salts

Canadian Journal of Chemistry ◽

10.1139/v70-486 ◽

1970 ◽

Vol 48 (18) ◽

pp. 2896-2899 ◽

Cited By ~ 6

Author(s):

J. A. Velazquez ◽

O. E. Hileman Jr

Keyword(s):

Constant Temperature ◽

Selective Extraction ◽

New Method ◽

Crystal Nucleation ◽

Inorganic Salts ◽

Nucleation Parameters ◽

Solutions Of Electrolytes

Vonnegut's droplet technique in combination with selective extraction of solvent is reported as a new method for the study of nucleation from solution of soluble substances at constant temperature. The method is applied to studies on NH4Cl, NH4NO3, NH4SCN, (NH4)2Cr2O7, and K2Cr2O7,. The results are reported and various nucleation parameters are calculated and discussed in terms of the limitations of the Becker–Doring model of nucleation when it is applied to crystal nucleation from solutions of electrolytes.

Download Full-text

Influence of Twist on Selected Properties of Multifilament Yarn

Autex Research Journal ◽

10.1515/aut-2017-0018 ◽

2018 ◽

Vol 18 (2) ◽

pp. 110-120

Author(s):

Iva Mertová ◽

Eva Moučková ◽

Bohuslav Neckář ◽

Monika Vyšanská

Keyword(s):

Cross Section ◽

Fiber Bundle ◽

Structural Parameters ◽

Sectional Area ◽

Fiber Stress ◽

Cross Sectional ◽

Yarn Twist ◽

Section Shape ◽

Multifilament Yarn ◽

Multifilament Yarns

Abstract Owing to twisting of filament fiber bundle, the structure and consequently various parameters and properties of a fiber bundle are changed. The aim of the work is to verify the effect of multifilament yarn twist (or twist coefficient) on selected mechanical properties such as multifilament tenacity, breaking elongation, and coefficient of fiber stress utilization in the yarn. Furthermore, the influence of twist on structural parameters such as the angle of peripheral fibers, the packing density, and the substance cross-sectional area of fiber bundle is observed. Two multifilament yarns with different filament cross-section shape and material were used for the experiment. Experimentally obtained data was compared with the known model dependencies derived decades ago based on the helical model. It can be stated that multifilament yarn retraction can be predicted based on the angle of peripheral fibers using the Braschler’s model. The coefficient of fiber stress utilization in the multifilament yarn determined experimentally corresponds with a theoretical curve, constructed according to Gégauff and Neckář, in the area of Koechlin’s twist coefficient α > 54 ktex1/2 m−1. Results as well as possible causes of deviations of experimental data from the theoretical one are discussed in this work.

Download Full-text

A New Method for Code Optimization

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.599-601.1346 ◽

2014 ◽

Vol 599-601 ◽

pp. 1346-1349

Author(s):

Hai Lin ◽

Bao Liang Mu

Keyword(s):

Data Flow ◽

Source Code ◽

Flow Analysis ◽

Simultaneous Equations ◽

New Method ◽

Code Optimization ◽

Data Flow Analysis ◽

Using Data ◽

Set Up

In this paper, we propose a new method for code optimization. This new method is based on backward data flow analysis, and the optimization is done on the source code level. First we design a tiny language to experiment with. Then, using data flow analysis, we set up some simultaneous equations and collect the liveness information for all program points. This is the basis for the optimization. Using this technique, some code can be safely eliminated without affecting the semantics of the code segment.

Download Full-text