Trace nanoanalysis

1994 ◽  
Vol 52 ◽  
pp. 940-941
Author(s):  
D. E. Newbury ◽  
R. D. Leapman
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Detection Efficiency ◽  
Volume Element ◽  
And Performance ◽  
Trace Constituents ◽  
Secondary Ion ◽  
Concentration Levels ◽  
Structure Properties

Trace constituents, which can be very loosely defined as those present at concentration levels below 1 percent, often exert influence on structure, properties, and performance far greater than what might be estimated from their proportion alone. Defining the role of trace constituents in the microstructure, or indeed even determining their location, makes great demands on the available array of microanalytical tools. These demands become increasingly more challenging as the dimensions of the volume element to be probed become smaller. For example, a cubic volume element of silicon with an edge dimension of 1 micrometer contains approximately 5×1010 atoms. High performance secondary ion mass spectrometry (SIMS) can be used to measure trace constituents to levels of hundreds of parts per billion from such a volume element (e. g., detection of at least 100 atoms to give 10% reproducibility with an overall detection efficiency of 1%, considering ionization, transmission, and counting).

Advances in imaging SIMS studies of stained and BrdU-labelled human metaphase chromosomes

1995 ◽  
Vol 53 ◽  
pp. 932-933
Author(s):  
R. Levi-Setti ◽  
J. M. Chabala ◽  
R. Espinosa ◽  
M. M. Le Beau
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Analytical Sensitivity ◽  
Metaphase Chromosomes ◽  
Banding Patterns ◽  
Sector Mass Spectrometer ◽  
Staining Methods ◽  
The University ◽  
Secondary Ion ◽  
Better Than

We have shown previously that isotope-labelled nucleotides in human metaphase chromosomes can be detected and mapped by imaging secondary ion mass spectrometry (SIMS), using the University of Chicago high resolution scanning ion microprobe (UC SIM). These early studies, conducted with BrdU- and 14C-thymidine-labelled chromosomes via detection of the Br and 28CN- (14C14N-> labelcarrying signals, provided some evidence for the condensation of the label into banding patterns along the chromatids (SIMS bands) reminiscent of the well known Q- and G-bands obtained by conventional staining methods for optical microscopy. The potential of this technique has been greatly enhanced by the recent upgrade of the UC SIM, now coupled to a high performance magnetic sector mass spectrometer in lieu of the previous RF quadrupole mass filter. The high transmission of the new spectrometer improves the SIMS analytical sensitivity of the microprobe better than a hundredfold, overcoming most of the previous imaging limitations resulting from low count statistics.

Mechanistic Study of the Role of One-Component Resins in Rubber-to-Brass Bonding in Tires

2004 ◽  
Vol 77 (5) ◽  
pp. 891-913 ◽  
Author(s):  
Pankaj Y. Patil ◽  
William J. van Ooij
Keyword(s):  
Reaction Time ◽  
Secondary Ion Mass Spectrometry ◽  
Gel Permeation Chromatography ◽  
Mechanistic Study ◽  
Coated Steel ◽  
Adhesion Promoters ◽  
Steel Cords ◽  
Adhesion Performance ◽  
Secondary Ion

Abstract Adhesion between rubber and brass-coated steel cords is enhanced by using resins as adhesion promoters. Experiments were carried out using a squalene liquid rubber modeling approach to study the effect of resins on the chemistry of the vulcanization reaction. The formation of new intermediates during vulcanization and changes in chemical concentrations with reaction time was studied using Gel Permeation Chromatography (GPC) analysis of the reacted squalene mixtures. Also, the effect of presence of resins on the surface of sulfidized brass cords was studied by analyzing the adhesion layer's elemental composition using the Electron Dispersive X-ray Spectroscopy (EDX) and Secondary Ion Mass Spectrometry (SIMS) characterization techniques. The changes in surface morphology of the adhesion layer with reaction time was noted by taking micrographs using the Scanning Electron Microscopy (SEM) technique. In this paper, a new mechanism is proposed for the role of resins in the improvement of initial and aged adhesion performance between rubber and brass-coated steel tire cords.

scholarly journals Remuneration and Performance

2020 ◽  
Vol 86 ◽  
pp. 01034
Author(s):  
Iriani Ismail
Keyword(s):  
High Performance ◽  
Qualitative Method ◽  
Optimal Performance ◽  
External Factors ◽  
Interactive Analysis ◽  
Analysis Methods ◽  
Depth Interview ◽  
And Performance ◽  
Internal And External Factors

The aim of this study is to explain the role of remuneration in improving the performance of library employees. This study uses the qualitative method which the population is all employees numbering 17 people. Based on interactive analysis methods and ethnographic techniques, its took In-depth interview and observations. Using this analysis, the result showed that the remuneration has an important role in improving employees performance. Some internal and external factors influence it so that optimal performance is obtained. Generally, employees expect that the remuneration has been high to be accepted like as expected. Most employees demands such remuneration to meet their daily needs. External factors also has a strong role so the employees demand high, but not balanced with high performance.

scholarly journals Πότε τα χαρισματικά παιδιά παρουσιάζουν χαμηλή επίδοση;

2017 ◽  
Vol 2016 (1) ◽  
pp. 172
Author(s):  
Ανδρονίκη Γάκη ◽  
Αλέξανδρος-Σταμάτιος Αντωνίου
Keyword(s):  
Family Environment ◽  
High Performance ◽  
Educational Methods ◽  
Asynchronous Development ◽  
The Family ◽  
Biological Development ◽  
Low Performance ◽  
And Performance

The purpose of this chapter is to outline the phenomenon of low performance often seen in the training of charismatic children. In particular, charisma is considered to be the ability of the child to achieve a particularly high performance in one or more areas and is usually perceived as an asynchronous development between his cognitive, emotional and biological development. "Under-performance" means a student's low performance, which runs counter to his / her mental potential and the potential that this entails. In fact, it is a mismatch between possibilities and performance and refers to the pupil's image, which while having the potential, but the results of his effort are not the expected ones. The causes are attributed to the different way of learning adopted by charismatic children, to their desire to be accepted by their peers, while the family environment also plays an important role. For this reason, the role of the educator, who must be aware of the importance of timely intervention and of using the appropriate educational methods for the integration of the child into the group, is important. 

scholarly journals The Role of Velocity Based Training in the Strength Periodization for Modern Athletes

2018 ◽  
Vol 3 (4) ◽  
pp. 55 ◽  
Author(s):  
Aristide Guerriero ◽  
Carlo Varalda ◽  
Maria Piacentini
Keyword(s):  
Resistance Training ◽  
High Performance ◽  
Daily Routine ◽  
Power Performance ◽  
Strength And Conditioning ◽  
Measurement Units ◽  
And Performance ◽  
Correct Understanding ◽  
Level Of Effort

Resistance training (RT) is considered the most important method to improve the athlete’s strength and rate of force development (RFD). In the last decade, the importance of monitoring velocity during RT has drastically grown, because of an increased availability of linear position transducers (LPT) and inertial measurement units (IMU). The purpose of this review is to analyze the existing literature on testing techniques and performance strategies used to enhance strength and power performance of elite athletes, by monitoring the velocity of resistance training. The authors focus in particular on the level of effort of resistance training defined by velocity; how the loss of velocity correlates with the degree of fatigue and how it can be used to enhance the performance of competitive athletes; the use of LPT as part of the daily routine of the strength and conditioning programs in competitive sport. It is therefore critical for the sports scientists to have a correct understanding of the basic concepts of the velocity-based training and their application to elite sports. The ultimate goal is to give some indications on the velocity-based resistance training integration in the programs of different sports in the high performance environment.

scholarly journals The role of performance feedback consistency in aspiration level adaptation: Evidence from a European grocery retailer

2019 ◽  
Vol 45 (1) ◽  
pp. 18-29
Author(s):  
Burak Cem Konduk
Keyword(s):  
Performance Feedback ◽  
High Performance ◽  
Past Research ◽  
Aspiration Level ◽  
Performance Targets ◽  
Aspiration Levels ◽  
Organizational Attention ◽  
And Performance ◽  
The Impact

This study investigates whether and how the impact of drivers of aspiration levels changes across the cases of consistent and inconsistent performance feedback within the context of a retailer. Analysis of internal corporate data shows that while past aspiration level and performance–aspiration gap positively influence the current aspiration level in the case of inconsistent feedback, performance feedback consistency changes only the impact of performance relative to peers. This study replicates past research in a different industry and country due to limited empirical evidence, introduces real-world complexity into aspiration theory, pinpoints performance–aspiration gap as the primary performance feedback, introduces a new sign for the impact of performance relative to peers, and reconciles its previously detected mixed impact. The findings suggest that organizational attention has an inward focus in the case of inconsistent feedback. The results also point out that leaders can trigger change through a performance outcome that lags behind the corresponding aspiration level rather than the performance of peers and eventually move their organizations toward high performance targets by starting with feasible rather than stretch goals.

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