scholarly journals Extensions of nonclosable operators and multiplication of distributions

2019 ◽  
pp. 6-17
Author(s):  
Anatolij B. Antonevich ◽  
Cemal Dolicanin
Keyword(s):  
Generalized Functions ◽  
Main Obstacle ◽  
Under Construction ◽  
Multiplication Of Distributions

In the paper some new constructions of extensions of nonclosable operators is proposed and several examples of applications are given. One of particular cases of the problem under consideration is the question on multiplication of distributions, a solution to which can be given by introduction of the so-called new generalized functions. It was demonstrated that the main obstacle for multiplication of distributions is nonclosablility of classical multiplication and the construction of new generalized functions is based on the ideas similar to that used under construction of the extension of nonclosable operators.

A Magnetic Spectrometer for a Scanning Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 436-437
Author(s):  
A. Kosiara ◽  
J. W. Wiggins ◽  
M. Beer
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Magnetic Spectrometer ◽  
Fringe Field ◽  
Curvature Radius ◽  
Magnetic Pole ◽  
Quadrupole Field ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Under Construction ◽  
Image Position

A magnetic spectrometer to be attached to the Johns Hopkins S. T. E. M. is under construction. Its main purpose will be to investigate electron interactions with biological molecules in the energy range of 40 KeV to 100 KeV. The spectrometer is of the type described by Kerwin and by Crewe Its magnetic pole boundary is given by the equationwhere R is the electron curvature radius. In our case, R = 15 cm. The electron beam will be deflected by an angle of 90°. The distance between the electron source and the pole boundary will be 30 cm. A linear fringe field will be generated by a quadrupole field arrangement. This is accomplished by a grounded mirror plate and a 45° taper of the magnetic pole.

Radiation Damage Studies with the HVEM

1972 ◽  
Vol 30 ◽  
pp. 680-681
Author(s):  
J. J. Laidler ◽  
B. Mastel
Keyword(s):  
Radiation Damage ◽  
Stainless Steels ◽  
Volume Expansion ◽  
Austenitic Stainless Steels ◽  
Test Facility ◽  
Fast Breeder Reactors ◽  
Breeder Reactors ◽  
Under Construction ◽  
Development Laboratory ◽  
Insight Into

One of the major materials problems encountered in the development of fast breeder reactors for commercial power generation is the phenomenon of swelling in core structural components and fuel cladding. This volume expansion, which is due to the retention of lattice vacancies by agglomeration into large polyhedral clusters (voids), may amount to ten percent or greater at goal fluences in some austenitic stainless steels. From a design standpoint, this is an undesirable situation, and it is necessary to obtain experimental confirmation that such excessive volume expansion will not occur in materials selected for core applications in the Fast Flux Test Facility, the prototypic LMFBR now under construction at the Hanford Engineering Development Laboratory (HEDL). The HEDL JEM-1000 1 MeV electron microscope is being used to provide an insight into trends of radiation damage accumulation in stainless steels, since it is possible to produce atom displacements at an accelerated rate with 1 MeV electrons, while the specimen is under continuous observation.

Description of a New High Resolution Scanning Transmission EM

1972 ◽  
Vol 30 ◽  
pp. 418-419
Author(s):  
Michael Beer ◽  
J. W. Wiggins ◽  
David Woodruff ◽  
Jon Zubin
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Energy Dispersive Spectrometer ◽  
Scanning Transmission Electron Microscope ◽  
Objective Lens ◽  
Condenser Lens ◽  
Transmission Electron ◽  
Pattern Size ◽  
Scanning Transmission ◽  
Under Construction

A high resolution scanning transmission electron microscope of the type developed by A. V. Crewe is under construction in this laboratory. The basic design is completed and construction is under way with completion expected by the end of this year.The optical column of the microscope will consist of a field emission electron source, an accelerating lens, condenser lens, objective lens, diffraction lens, an energy dispersive spectrometer, and three electron detectors. For any accelerating voltage the condenser lens function to provide a parallel beam at the entrance of the objective lens. The diffraction lens is weak and its current will be controlled by the objective lens current to give an electron diffraction pattern size which is independent of small changes in the objective lens current made to achieve focus at the specimen. The objective lens demagnifies the image of the field emission source so that its Gaussian size is small compared to the aberration limit.

Cochlea Under Construction

ASHA Leader ◽  
2011 ◽  
Vol 16 (9) ◽  
pp. 40-41
Author(s):  
Jessica J. Messersmith
Keyword(s):  
Under Construction

‘The well-known, old, but still unbeaten track’: Women Poets and Irish Periodical Culture in the Mid-Twentieth Century

2012 ◽  
Vol 42 (1) ◽  
pp. 32-52 ◽  
Author(s):  
Anne Mulhall
Keyword(s):  
Twentieth Century ◽  
Literary Culture ◽  
Woman Writer ◽  
Double Bind ◽  
Women Poets ◽  
Substantial Body ◽  
Growing Body ◽  
Critical Attention ◽  
Irish Women ◽  
Under Construction

While neglected Irish male poets of the mid century have seen some recuperation in recent decades, the work of Irish women poets still languishes in obscurity. A growing body of scholarship has identified the need to bring critical attention to bear on this substantial body of work. In this essay I explore the positioning of Irish women poets in mid-century periodical culture, to flesh out the ways in which the terms of this ‘forgetting’ are already established within the overwhelmingly masculinist homosocial suppositions and idioms that characterized contemporary debates about the proper lineage and aesthetic norms for the national literary culture that was then under construction. Within the terms set by those debates, the woman writer was caught in the double bind that afflicted any woman wishing to engage in a public, politicized forum in post-revolutionary Ireland. While women poets engage in sporadic or oblique terms with such literary and cultural debates, more often their voices are absent from these dominant discourses – the logic of this absence has continued in the occlusion of these women poets from the national poetic canon.

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