Study the Effect of Stripe Height and Read Track Width on Blocking Temperature

2015 ◽  
Vol 781 ◽  
pp. 199-202
Author(s):  
Chayapim Kulpromsaro ◽  
Kasin Vichienchom ◽  
Wanchai Pijitrojana
Keyword(s):  
Thermal Stability ◽  
Small Volume ◽  
Areal Density ◽  
Blocking Temperature ◽  
Track Width ◽  
Read Head ◽  
Reliability Issue ◽  
The Relationship

The magnetic read head technology is continuously designed to become smaller in order to get the highest areal density. Due to small volume the thermal stability is investigate for this study. The objective of this research is to study the relationship between the dimension of read head sensor and its blocking temperature. Stripe Height and Read track width were considered for this study. The result is blocking temperature decreasing with short stripe height. Advantage of this study is the reliability issue especially blocking temperature was captured by using resistance.

Investigation on the recycling of sulfuric acid from pretreatment of cellulose for nanocellulose preparation

TAPPI Journal ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 103-111
Author(s):  
CHAOYU DUAN ◽  
YANGYANG PENG ◽  
SHIYU FU ◽  
LUCIAN LUCIA
Keyword(s):  
Thermal Stability ◽  
Sulfuric Acid ◽  
Zeta Potential ◽  
Surface Properties ◽  
Value Chain ◽  
Solid Residue ◽  
Number Of Cycles ◽  
The Relationship

Sulfuric acid is often used to pretreat cellulose prior to homogenization and conversion to nanocellulose. It would be economically significant to reuse the acid to close the overall value chain loop. The target of this work was to investigate the effect of recovery and recycling frequency of sulfuric acid from the pretreatments on the pretreatment yield of water-insoluble cellulose solid residue, and to explore the relationship between the nanocellulose size prepared by recovery of acid and number of cycles. The surface properties of the nanocelluloses were measured, including content of sulfate groups, absolute zeta potential, crystallinity, and thermal stability.

Cutting resistance of flexible armour using multiple layers of triaxial kevlar fabric

2020 ◽  
pp. 152808372096827
Author(s):  
Magdi El Messiry ◽  
Shaimaa Youssef El-Tarfawy
Keyword(s):  
Cutting Force ◽  
Areal Density ◽  
Resistance Force ◽  
Knitted Fabric ◽  
Cutting Resistance ◽  
First Case ◽  
Weft Knitted Fabric ◽  
Cut Resistance ◽  
The Relationship ◽  
Resistance Value

The textiles capable of cutting resistance found applications in the industrial and military areas to construct flexible lightweight soft body armors. In the present work, a theoretical model to understand the mechanism of fabric cut resistance in a different direction for weft-knitted, triaxial, and multiple layers structures. An experimental study of cutting resistance force was done on weft-knitted fabric with Kevlar 29 triaxial fabrics in multiple layers structure to support derived mathematical model for the effect of multiple layers structure on their cutting force. The study examines specific cut resistance of the structure from four layers of Kevlar triaxial fabrics covered with knitted fabric on both sides. The angle of cutting force varied from 0°, 60°, and 90° with respect to the yarn inclination. Results show that the cutting force of the multilayer structure is linearly proportional to the number of Kevlar triaxial fabrics layers. The specific cut resistance value of the structure from four layers of Kevlar triaxial fabrics, covered with knitted fabric on both sides, reached 544, 435, and 326 (N/g/cm2) for cutting directions: angled 60°, vertical, and horizontal, respectively. In this work, the comparison between the triaxial fabric of high areal density and multiple layers of triaxial fabric with resultant same areal density indicates that a better specific cutting force was achieved in the first case. Furthermore, it investigated the relationship between triaxial surface density, the direction of cutting, and the number of triaxial fabric layers and discussed the optimum specific properties of the different structures.

scholarly journals Ballistic Impact Performance of SiC Ceramic-Dyneema Fiber Composite Materials

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Kai-Kuang Wu ◽  
Yu-Liang Chen ◽  
Jau-Nan Yeh ◽  
Wei-Lun Chen ◽  
Chia-Shih Lin
Keyword(s):  
Composite Material ◽  
Simulation Analysis ◽  
Fiber Composite ◽  
Areal Density ◽  
Target Plate ◽  
Composite Target ◽  
Impact Performance ◽  
Ballistic Resistance ◽  
Sic Ceramic ◽  
The Relationship

This study investigated the ballistic resistance of a composite target plate fabricated by combining SiC ceramic with the Dyneema fiber. To achieve a light-weight target plate that conforms to the US National Institute of Justice level four (NIJ IV) standards, minimal areal density analysis was conducted to obtain the optimal SiC ceramic-Dyneema fiber thickness combination. This study used energy absorption to analyze the ballistic resistance of the target plates. To drastically reduce experimental costs, most of this work employed ANSYS/LS-DYNA software to conduct finite element numerical simulations. First, ballistic experiments that conformed to NIJ IV standards were conducted to verify the simulation parameter configurations. Subsequently, the correlation function of the relationship between the combined thickness of the composite material and its ballistic resistance was determined through the experimental design, which effectively reduced the simulation analysis time. According to simulation experiments and regression analysis, the equation for the relationship between the combined thickness of the composite material and its ballistic resistance was EAhc,hf=−6276.5+500.6hc+1512.6hf+30.7hchf−8.1hc2−113.6hf2, though there were limitations to its application. From the numerical analysis results, 8.1940 mm SiC ceramic and 6.9637 mm Dyneema fiber were determined to constitute the optimal thickness combination for a composite that features a minimal areal density and which conforms to NIJ IV standards. The combination was verified to be consistent with the numerical simulation analysis results.

Gold–copper–bismuth mineralization in hedenbergitic skarn, Tombstone Mountains, Yukon

1987 ◽  
Vol 24 (12) ◽  
pp. 2362-2372 ◽  
Author(s):  
Isobel J. Brown ◽  
Bruce E. Nesbitt
Keyword(s):  
Large Scale ◽  
Small Volume ◽  
Gold Mineralization ◽  
Rock Interaction ◽  
The North ◽  
Mineral Assemblages ◽  
Intrusive Rocks ◽  
Porosity And Permeability ◽  
Relationship Of ◽  
The Relationship

Gold mineralization on the Marn property, Yukon, occurs in two pyroxene skarn bodies, which are adjacent to the Mount Brenner Stock in the Ogilvie Mountains. The skarns are separated by a 600 m wide monzonite intrusion and show contrasting mineralogical and geochemical characteristics in addition to quite different metal values. Significant but uneconomic Au, Ag, W, and Cu mineralization is found in skarn on the north side of the intrusion, while very low Au grades (0.052 g/t) occur at the southern contact. The mineral assemblages of both skarns are dominated by iron-rich pyroxenes. The iron content of the pyroxenes varies between Hd40 and Hd80 in the northern location and Hd80 and Hd100 in the southern skarn. A well-developed sequence of retrograde alteration affected only the northern skarn. This was probably the result of porosity and permeability differences in the early, high-temperature pyroxene skarn, which permitted greater fluid–rock interaction in the northern skarn during cooling. A small volume of diopsidic, aluminous, wollastonite-bearing skarn occurs in both the northern and southern localities. The relationship of this type of skarn to the hedenbergitic skarn is ambiguous, since there is no large-scale mineralogical zoning. The Marn is similar to hedenbergitic, auriferous skarns of Japan, where the oxidation state of the intrusive rocks is believed to be the controlling factor in the development of skarn mineralogy.

Thermal Stability vs. Crystallization of the Lithiumsilicate Glasses with Addition Zirconium Dioxide and Titanium Dioxide

2008 ◽  
Vol 39-40 ◽  
pp. 399-401
Author(s):  
Viliam Pavlík ◽  
Eugen Jóna ◽  
Martina Sapietová ◽  
Soňa Šnircová
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Titanium Dioxide ◽  
Differential Thermal Analysis ◽  
Structural Analysis ◽  
Zirconium Dioxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Relationship

The glasses with composition of Li2O . 2 SiO2 . n ZrO2 . n TiO2 (where n = 0; 0.015; 0.031; 0.050; 0.075; 0.1; 0.15; 0.2) were prepared and the relationship between structural and selected parameters of thermal stability vs. crystallization has been studied by differential thermal analysis. Structural analysis was provided by X–ray diffraction. The order of thermal stability vs. crystallization representing of activation energy of studied glass systems which increase with higher addition both oxides. The same order was obtained from the values of XRD. On the comparison the glasses with zero addition titanium dioxide their activation energy was much higher.

The relationship between animal age and the thermal stability and cross-link content of collagen from five goat muscles

Meat Science ◽  
1991 ◽  
Vol 29 (3) ◽  
pp. 251-262 ◽  
Author(s):  
Douglas J. Horgan ◽  
Peter N. Jones ◽  
Neville L. King ◽  
Lyndon B. Kurth ◽  
Ronald Kuypers
Keyword(s):  
Thermal Stability ◽  
Cross Link ◽  
The Relationship
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