Laser Induced Damage in Fused Silica for 248 nm

2017 ◽  
Vol 726 ◽  
pp. 378-382
Author(s):  
Hui Wang ◽  
Bo Fu ◽  
Lan Jian Nie ◽  
Zhu Feng Shao ◽  
Ya Nan Jia ◽  
...  

For the key-optical material, the laser induced damage character of fused silica is crucial for the application among the optical laser fitting. As the defect of each point of the silica sample is diverse, and the lasers focus point by point, we divided the sample block into three-dimensional structure for each laser-point to discuss the relationship between the LIDT of each points and the OH-content. The result shows that the LIDT of the center of the sample block is up to 10-11J/cm2 which is consistent after the treatment while the LIDT of border pieces is 9-10 J/cm2. The different temperature and the aggradation during the fusing process and the machine process caused the different OH content of different location of the sample.

2018 ◽  
Vol 51 (4) ◽  
pp. 1125-1132 ◽  
Author(s):  
Z. B. Zhao ◽  
Q. J. Wang ◽  
H. Wang ◽  
J. R. Liu ◽  
R. Yang

The relationship between the crystallographic orientation and habit plane normal of transformed α laths in titanium alloys is discussed according to the Burgers orientation relationship and the three-dimensional structure of the α lath. A new method (orientation–trace method) is developed to determine the orientation of the parent β phase using the orientation of the α lath, which was measured by electron backscatter diffraction, and the microstructural morphology of that α variant. This approach is validated in a near-α titanium alloy. Moreover, the habit plane normal direction of the transformed α lath can be obtained from the crystallographic orientations of the α lath itself and its parent β grain. The verification and the corresponding discussion show the reliability of this approach.


Geophysics ◽  
1985 ◽  
Vol 50 (10) ◽  
pp. 1610-1617 ◽  
Author(s):  
Simon Spitz

A serious limitation to conventional data analysis is that the data refer mainly to elongated bodies. When three‐dimensional distortions are present, quantitative interpretation based only on the off‐diagonal elements of the conventionally rotated impedance tensor is inadequate, because these off‐diagonal elements are insensitive to the tensor trace. The impedance tensor eigenstate formulation proposed in the literature defines a complete set of parameters suitable for recognition of three‐dimensionality. Generally, though, the eigenvalues do not stand for the off‐diagonal elements of an impedance tensor measured in a physical coordinate system. It is shown how the eigenvalues are modified when the relationship between coordinate system rotations and the eigenstate formulation is clarified. A generalization of the conventional analysis results, but the rotation angle obtained is neither unique nor complete To improve the situation, two new analytical rotation angles are proposed. These angles define two complete intrinsic coordinate systems suitable for magnetotelluric data analysis when a general three‐dimensional structure is involved.


2016 ◽  
Vol 31 (7) ◽  
pp. 1152-1166 ◽  
Author(s):  
Rita Chiesa ◽  
Stefano Toderi ◽  
Paola Dordoni ◽  
Kene Henkens ◽  
Elena Maria Fiabane ◽  
...  

Purpose The purpose of this paper is to explore the relationship between organizational age stereotypes and occupational self-efficacy. First, the authors intend to test the measurement invariance of Henkens’s (2005) age stereotypes scale across two age group, respectively, under 50 and 50 years and older. Then, the moderator role of age groups in the relationship between age stereotypes and occupational self-efficacy is investigated. Design/methodology/approach The survey involved a large sample of 4,667 Italian bank sector’s employees. Findings The results show the invariance of the three dimensional structure of organizational stereotypes towards older workers scale: productivity, reliability and adaptability. Furthermore, the moderation is confirmed: the relationship between organizational age stereotypes and occupational self-efficacy is significant only for older respondents. Research limitations/implications Future studies should aim to replicate the findings with longitudinal designs. Practical implications The study suggests the importance to emphasize the positive characteristics of older workers and to reduce the presence of negative age stereotypes in the workplace, especially in order to foster the occupational self-efficacy of older workers. Originality/value The findings are especially relevant in view of the lack of evidence about the relationship between age stereotypes and occupational self-efficacy.


Author(s):  
Janith Samarasinghe ◽  
Stephen J. Peluso ◽  
Bryan D. Quay ◽  
Domenic A. Santavicca

Flame structure is an important aspect of the combustion process which must be considered in the design of gas turbine combustors as it can have a significant effect on the combustor’s static stability (blowoff) and dynamic stability (combustion instability). The relationship between flame structure and flame stability has been studied extensively in single-nozzle combustors. However, relatively few studies have been conducted in multi-nozzle combustor configurations typical of actual gas turbine combustion systems. In this paper, a chemiluminescence-based tomographic reconstruction technique is used to obtain three-dimensional images of the flame structure in a laboratory-scale five-nozzle can combustor. The images reveal the complex three-dimensional structure of this multi-nozzle flame, as well as, the effects of interacting swirling flows, flame-flame interactions and flame-wall interactions on flame structure.


2001 ◽  
Vol 47 (2) ◽  
pp. 158-164 ◽  
Author(s):  
C Nazábal ◽  
T Carmenate ◽  
S Cruz ◽  
S González ◽  
R Silva ◽  
...  

P64k is a minor outer membrane protein from Neisseria meningitidis. This protein has been produced at high levels in Escherichia coli. We generated a group of monoclonal antibodies (mAbs) against recombinant P64k, which recognise four non-overlapping epitopes, as shown using competition assays with biotinylated mAbs. The P64k sequences involved in mAbs binding were mapped with synthetic overlapping peptides derived from the P64k protein, and located in the previously determined three-dimensional structure of the protein. These antibodies were also characterised by whole-cell ELISA and bactericidal tests against N. meningitidis. Only two of the recognised epitopes were exposed on the bacterial surface, and none of the mAbs showed bactericidal activity. The relationship between these results and the structural data on the epitopes bound by the mAbs is discussed.Key words: Neisseria meningitidis, P64k, monoclonal antibodies, epitope mapping.


2013 ◽  
Vol 300-301 ◽  
pp. 423-426
Author(s):  
Yong Cai

Three-dimensional visual scanning is an advanced non-contact measurement approach that can obtain a complete surface model of object. But, in the method, the local raster point cloud sets calculated must be registered to a whole. To reduce fluctuating errors and increase efficiency, we propose a new method that scanner can be moved around object guided by pre-planning trajectory of the robot. First, considering the structural parameters of the robot, the Inverse Kinematics Problem of each joint rotating function is derived, and the moving trajectory is simulated. Then, the relationship between the distances of controlled motion and data gotten by scanner is analyzed, a transform matrix which registered the local point cloud sets is deduced, the raster data can be normalized to the world coordinate by it. The experimental results show that error of registration is less than 0.09mm. The method is suited to measuring different targets in robot workspace. It can improve the efficiency and flexibility of visual measurement system.


2015 ◽  
Vol 3 (2) ◽  
pp. 157
Author(s):  
Kyriakos Charalampous ◽  
Constantinos M Kokkinos

The purpose of the present paper was to review the extant research on Classroom Psycho-Social Climate (CPSC), in order to underscore and resolve misconceptions, contradictions, and deficiencies, as well as to critically present two of its most important research accomplishments: (a) the construction of a plethora of valid and reliable research instruments to measure the construct of CPSC in various learning environments and at different educational levels, and (b) the association of CPSC with cognitive and affective learning outcomes. The definitions proposed for CPSC are generally characterized by ambiguity. Yet, most researchers agree that the CPSC represents a multidimensional construct, the defining indicators of which, tend to be statistically confirmed in most studies, while at the same time new ones are added, thus providing the construct with a dynamic status. Various theories have been proposed to conceptualize CPSC, the most acknowledged being that of Lewin’s (1936) Field Theory, Murray’s (1938) Needs-Press model, and Getzel and Thelen’s (1960) Socio-Psychological Theory. Two independent research programs and their enduring theoretical and empirical legacy signaled the new era in CPSC research. Rudolf Moos proposed a three-dimensional structure descriptive of all psycho-social climates regardless of the social context (school classrooms, correctional institutions, military facilities, etc.) (1974), and Herbert Walberg demonstrated that students’ were in position to make valid inferences regarding CPSC (1969). Contemporary CPSC research has revealed some methodological issues which need to be taken into consideration when designing CPSC studies. One of the most remarkable achievements of CPSC research is the development of many valid and widely used research instruments for measuring CPSC in various educational contexts and at different educational levels. These instruments reflect the expansion of CPSC research in terms of the integration of new conceptual dimensions, as well as the widening of the age level of students to whom they are addressed. However, despite the increased production of mixed-methods studies in contemporary CPSC research, the cross-cultural adaptation of CPSC instruments, especially those addressing elementary students, has resulted in ambiguous findings. Moreover, whereas most CPSC instruments are based on Moos’s three-dimensional proposal, empirical findings support different allocation of the subscales in these dimensions than the scale developers. Another significant outcome of CPSC research is the examination of the association of CPSC with students’ cognitive and affective learning outcomes. Indeed, empirical findings support the link between the CPSC and various learning outcomes, such as academic achievement, attitudes, self-efficacy, motivation, self-handicapping, and students’ emotional and cognitive involvement. In addition, contemporary CPSC research has examined different paths through which CPSC affects student outcomes. For example, researchers have shown that self-efficacy and achievement goals mediate the relationship between CPSC and student outcomes, such as academic achievement, emotional involvement, etc. Nonetheless, and despite the extended investigation of the relationship between CPSC and student outcomes, research has failed to present consistent evidence with regards to the effect of specific CPSC indicators on student outcomes. What’s more, in cases where CPSC indicators presented negative associations with student outcomes, the explanations provided were insufficient, whereas follow up investigations did not take place. Of course CPSC research has followed other fruitful directions which are also presented in this review. Practical implications of CPSC research findings and future research directions are also discussed.


2015 ◽  
Vol 18 (1) ◽  
pp. 14
Author(s):  
Maria Omega ◽  
Ross T. Barnard

The aim of this study is to analyze the relationship between the types of G6PD mutations found in Indonesia and the relationships of mutations found in Indonesia to those found in other countries. We summarize the distribution of G6PDs in West Indonesia and East Indonesia. Moreover, we use bioinformatics methods to construct phylogenetic trees and compare the sequences containing the regions amplifi ed by the commonly used PCR primer pairs. Previous work has shown that Mediterranean G6PD and Chinese CoimbraG6PDare distributed in West Indonesia, whilst G6PD mutations in East Indonesia are Jammu/ViangchanG6PD and Chinese Gaohe G6PD. G6PD Jammu/Viangchan was mostly distributed in Flores Island, East Indonesia along with G6PDGaohe. We constructed phylogenetic trees using the G6PD sequences from various regions in Indonesia and other countries. It appears from phylogenetic trees and percentages of identity that FloresIndonesian G6PD defi ciency (Jammu/Viangchan G6PD, originating in India) is 92.5% identical to the G6PD defi ciency of Chinese origin (GaoheG6PD). It was interesting to note that the genetic region containing the Javanese Indonesian G6PD defi ciency (MediterraneanG6PD, fi rst found in Italy) located in the western parts of Indonesia is closely related (99% identity) to the Chinese G6PD defi ciency(Coimbra G6PD). We concludethat G6PD mutations in West Indonesia are closely related to G6PD mutations from China. G6PD mutations in East Indonesia are also closely related to G6PD mutations from India and China, but more distantly, and to different types to those in West Indonesia. A prediction of protein structure was carried out which allowed visualization of the locations of mutation on the three dimensional structure of G6PD. Key words: G6PD, phylogeny, origin, genetic mutations


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