Friction Force Analysis on Diaomond Lapping of Sapphire Wafers

2013 ◽  
Vol 797 ◽  
pp. 461-468 ◽  
Author(s):  
Chao Chang Arthur Chen ◽  
Ching Hsiang Tseng ◽  
Wei Kang Tu
Keyword(s):  
Aluminum Oxide ◽  
Copper Plate ◽  
Endpoint Detection ◽  
Critical Factors ◽  
Force Analysis ◽  
Transient Region ◽  
Test Parameters ◽  
The Coefficient Of Friction ◽  
Relationship Of ◽  
The Relationship

This paper is to design and developing a friction sensor system (FSS) for prediction of endpoint detection (EPD) on diamond lapping of sapphire or mono-crystalline aluminum oxide wafers. The endpoint detection usually includes start region, lapping region, transient region and endpoint region to control the planarization procedure by diamond lapping with variant plate of copper, resin copper, or tin materials. Experiments have been performed with 9 tests composed by three kinds of viscosity of slurry lapping with three kinds of lap plates. The coefficient of friction (CoF) has been obtained by the designed FSS and then compared with different test parameters. The as-lapped sapphire wafers have also measured by coherence surface interferometer, CCI-Lite (Taylor Hobson, UK). Experimental results show that the hardness of plate and viscosity of slurry are critical factors for as-lapped wafer quality. The EPD of diamond lapping with resin copper plate can be determined by the CoF data and that can be used for justifying the appropriate lapping time of sapphire wafers. Future study can focus on the relationship of sub-surface crack caused by the diamond lapping process.

Force Analysis and Modeling of Carbon Nanowires Operation in SEM

2011 ◽  
Vol 183-185 ◽  
pp. 1901-1906
Author(s):  
Wei Bin Rong ◽  
Dong Jie Li ◽  
Li Ning Sun ◽  
Jin Yu Wang
Keyword(s):  
Size Effect ◽  
Experimental System ◽  
Force Analysis ◽  
Simplified Models ◽  
Relationship Of ◽  
Influence Degree ◽  
The Relationship ◽  
Carbon Nanowires

Due to influence of size effect, the force properties in nanoscale are greatly different from those in macroscale and the traditional models of operation are becoming difficult to meet the development of nanoscale manipulation. To provide guiding theory for practical nano-manipulation, the nanoscale forces of contact and non-contact operation of nanowires are analyzed for nano-manipulation in SEM. The Vander Waals models among the probe, nanowire and substrate are modeled according to the force properties in nanoscale, and then the simplified models are simulated with MATLAB. The influence degree of various factors and the relationship of them during the operation are obtained. At last, experimental system is established to verify the correctness of the proposed models.

The Loading Ability Analysis of Spiral Spline

2013 ◽  
Vol 475-476 ◽  
pp. 1507-1512
Author(s):  
Jun Yang ◽  
Hua Li ◽  
Qing Tao Li ◽  
Jin Yao
Keyword(s):  
Shear Stress ◽  
Equivalent Stress ◽  
Force Analysis ◽  
Calculation Methods ◽  
Flexural Stress ◽  
Relationship Of ◽  
The Relationship

With the detailed force analysis of spiral spline transmission, the relationship of each force was derived. On the basis of this, referred to the designing and checking criterion of the straight-tooth spline transmission and spiral transmission, the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side, the shear stress and the max-flexural stress of the spiral spline teeth root, and the equivalent stress of the screw bolt were derived, and the checking criterions for them were put forward. An example, the surface extrusion stress through the calculation methods compared with that through ANSYSWorkbench simulation, verifies the calculation methods of the surface extrusion stress (or pressure) of the spiral spline teeth side.

Developing international managers: the contribution of cultural experience to learning

2015 ◽  
Vol 29 (2) ◽  
pp. 234-251
Author(s):  
Peter Townsend ◽  
Padraic Regan ◽  
Liang Liang Li
Keyword(s):  
Cultural Adaptation ◽  
Learning Strategy ◽  
Maximum Level ◽  
Asia Pacific ◽  
Theoretical Construct ◽  
Critical Factors ◽  
Cultural Experience ◽  
Content Type ◽  
Relationship Of ◽  
The Relationship

Purpose – The purpose of this paper is to evaluate cultural experience as a learning strategy for developing international managers. Design/methodology/approach – Using an integrated framework, two quantitative studies, based on empirical methodology, are conducted. Study 1, with an undergraduate sample situated in the Asia Pacific, aimed to examine the relationship between cultural experience and intercultural capability (IC), an original theoretical construct representing the critical factors of international managers. Study 2, employing a more culturally experienced postgraduate sample from Ireland, sought to confirm the findings from study 1 and further test the relationship of cultural experience with the factor of cultural adaptation. Findings – Results identify a U-curve relationship of cultural experience and cultural adaptation for inexperienced students (study 1). A more linear, but less significant relationship between the above two with a maximum level of adaptation for more experienced students was found in study 2. This implies that there is a relationship between cultural experience and IC, within the limitations of the sample. However, whilst cultural experience is a major variable in developing IC, findings are that universities and industry training managers need to use a blended learning approach when developing international managers, hence, combining cultural experience (experiential learning) with didactic methods. Originality/value – This is an original theoretical construct representing the critical factors of international managers.

Research of the effect of shot peening vibro-abrasive machining on the properties of the steel NC11LV

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 74-75
Author(s):  
Sławomir Spadło ◽  
Damian Bańkowski ◽  
Joanna Kowalczyk
Keyword(s):  
Coefficient Of Friction ◽  
Shot Peening ◽  
Friction And Wear ◽  
Abrasive Machining ◽  
Tribological Tests ◽  
Working Medium ◽  
The Coefficient Of Friction ◽  
Relationship Of ◽  
The Relationship

The article presents the results of the effect of vibro-abrasive machining using as a working medium balls of steel-check on the properties of disks made of steel NC11 (X160CrMoV121). Tribological tests using the tester T-01 made it possible to determine the relationship of time of shot peening on the coefficient of friction and wear linear-in. They were presented typical consumption profiles.

scholarly journals Critical Factors of the Adoption of e-Textbooks: A Comparison Between Experienced and Inexperienced Users

2018 ◽  
Vol 19 (4) ◽  
Author(s):  
Wei-Hsi Hung ◽  
Pei-Hsuan Hsieh ◽  
Yao-De Huang
Keyword(s):  
Behavioral Intention ◽  
Social Impact ◽  
Theoretical Perspective ◽  
Critical Factors ◽  
Factors Affecting ◽  
Performance Expectancy ◽  
And Performance ◽  
Relationship Of ◽  
The Relationship ◽  
And Task

The use of e-textbooks has become popular in certain countries, yet there is debate in the literature about whether it is advantageous to adopt e-textbooks and if they positively influence students’ learning and performance. Prior studies on the acceptance of e-textbooks were mainly based on one theoretical perspective, and did not differentiate samples between experienced and inexperienced users. From a social- and task-related view, this study aims to identify the critical factors that stimulate acceptance intentions of e-textbooks among tertiary students, particularly between experienced and inexperienced users. Based on 912 questionnaires, this study found that performance expectancy, perceived enjoyment, and perceived task-technology fit are the factors affecting students’ behavioral intention for acceptance in both sampling groups. However, social impact only has significant influence on acceptance intention of inexperienced users. Also, gender has a moderating effect on the relationship of performance expectancy and behavioral intention of inexperienced users only. This study provides useful implications for marketing e-textbooks, and fills the literature gap.

scholarly journals Graft Angle and Its Relationship to Tomato Plant Survival

HortScience ◽  
2013 ◽  
Vol 48 (1) ◽  
pp. 34-36 ◽  
Author(s):  
Michael G. Bausher
Keyword(s):  
Large Scale ◽  
Ground Level ◽  
Soil Fumigation ◽  
Force Analysis ◽  
Plant Survival ◽  
Pull Force ◽  
Survival Percentage ◽  
Relationship Of ◽  
Graft Angle ◽  
The Relationship

Growing transplants that can withstand the rigors of open-field production is imperative for the successful adoption of grafting in large-scale commercial fields and especially for those who seek to adopt this technology as an alternative to soil fumigation. This study examines the relationship of tensile strength to graft angle and plant survival. Tomato (Solanum lycopersicum) seedlings of ‘FL-47’ and ‘Rutgers’ were used as scions on ‘Roma’ rootstock under greenhouse and healing chamber conditions. Scions were grafted at angles of 20°, 45°, and 70°. After a period of 10 days, the plants were severed near ground level and subjected to pull force analysis. Pull force of the graft increased significantly with the increased graft angle. Pull force between the 20° vs. 70° angles increased significantly as well as those of 45° vs. 70° grafts (P ≤ 0.001). Increase in graft angle resulted in greater survival of grafted plants from 79% (20°), 81% (45°), and 92% (70°). Fifteen commercial rootstocks grafted at 70° had survival percentage rates between 97% and 100%. These studies demonstrate that the angle can significantly impact graft integrity and plant survival.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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