scholarly journals Physical-chemical purification of power metal optics for increasing its service life

2017 ◽  
Author(s):  
S. A. Filin ◽  
V. E. Rogalin ◽  
I. A. Kaplunov ◽  
K. M. Zingerman
Keyword(s):  
Service Life ◽  
Chemical Purification ◽  
Metal Optics ◽  
Physical Chemical

Deep Physical-Chemical Purification of Gas Medium in Artificial Ecosystems

2020 ◽  
Vol 492 (1) ◽  
pp. 112-116
Author(s):  
S. V. Trifonov ◽  
V. V. Velichko ◽  
N. A. Tikhomirova ◽  
V. N. Shikhov ◽  
E. A. Morozov ◽  
...  
Keyword(s):  
Chemical Purification ◽  
Physical Chemical ◽  
Artificial Ecosystems ◽  
Gas Medium

scholarly journals Improvement of the tribological properties of heavy-loaded friction units “Centre block-footstep bearing” of a freight car

2021 ◽  
Vol 2131 (5) ◽  
pp. 052033
Author(s):  
A Sychev ◽  
V Avilov ◽  
M Savenkova ◽  
E Luneva ◽  
A Sychev
Keyword(s):  
Service Life ◽  
Tribological Properties ◽  
Friction Unit ◽  
Inorganic Polymers ◽  
Adhesion Properties ◽  
Friction Units ◽  
Physical Chemical ◽  
Operational Tests ◽  
Freight Car ◽  
Friction Surfaces

Abstract Various problems and different approaches of solution of such a problematic unit as “centre block-footstep bearing” of freight cars are discussed in the paper. The methods of improving the tribological properties of this friction unit by means of material modification of friction surfaces and perfection of physical, chemical and tribological properties of the used lubricants were studied. Grease lubricants common for friction units of railway machinery were used after being modified with inorganic polymers based on double metaphosphates. Bench and operational tests of the developed additive of the polymeric double metaphosphates were carried out. This additive reduces wear and increases the service life of the friction unit, due to the better adhesion properties of this additive. The variants with a change in the geometry of the contact surface of the disk between the bolster and the “centre block-footstep bearing” arrangement of the car are considered. Simulation of the parameters of movement in curved sections is proposed.

scholarly journals A brief review of methods for increasing the service life of laser metal optics

2017 ◽  
pp. 44-51 ◽  
Author(s):  
S. A. Filin ◽  
◽  
V. E. Rogalin ◽  
I. A. Kaplunov ◽  
S. A. Tretiakov ◽  
...  
Keyword(s):  
Service Life ◽  
Metal Optics

Transmission Electron Microscopy of Protein Macromolecules

1971 ◽  
Vol 29 ◽  
pp. 424-425
Author(s):  
Henry S. Slayter
Keyword(s):  
Biological Systems ◽  
Metal Vapor ◽  
Resolving Power ◽  
Electron Microscopic ◽  
Chemical Methods ◽  
Molecular Weights ◽  
The Past ◽  
Physical Chemical ◽  
Transmission Electron

Electron microscopic methods have been applied increasingly during the past fifteen years, to problems in structural molecular biology. Used in conjunction with physical chemical methods and/or Fourier methods of analysis, they constitute powerful tools for determining sizes, shapes and modes of aggregation of biopolymers with molecular weights greater than 50, 000. However, the application of the e.m. to the determination of very fine structure approaching the limit of instrumental resolving power in biological systems has not been productive, due to various difficulties such as the destructive effects of dehydration, damage to the specimen by the electron beam, and lack of adequate and specific contrast. One of the most satisfactory methods for contrasting individual macromolecules involves the deposition of heavy metal vapor upon the specimen. We have investigated this process, and present here what we believe to be the more important considerations for optimizing it. Results of the application of these methods to several biological systems including muscle proteins, fibrinogen, ribosomes and chromatin will be discussed.

Seeking to uncover biology's chemical roots

2019 ◽  
Vol 3 (5) ◽  
pp. 435-443 ◽  
Author(s):  
Addy Pross
Keyword(s):  
Environmental Changes ◽  
Biological Systems ◽  
Significant Development ◽  
The Road ◽  
Physical Chemical ◽  
Systems Chemistry ◽  
Biological World ◽  
Inanimate Matter ◽  
The Origin Of Life ◽  
Opening Up

Despite the considerable advances in molecular biology over the past several decades, the nature of the physical–chemical process by which inanimate matter become transformed into simplest life remains elusive. In this review, we describe recent advances in a relatively new area of chemistry, systems chemistry, which attempts to uncover the physical–chemical principles underlying that remarkable transformation. A significant development has been the discovery that within the space of chemical potentiality there exists a largely unexplored kinetic domain which could be termed dynamic kinetic chemistry. Our analysis suggests that all biological systems and associated sub-systems belong to this distinct domain, thereby facilitating the placement of biological systems within a coherent physical/chemical framework. That discovery offers new insights into the origin of life process, as well as opening the door toward the preparation of active materials able to self-heal, adapt to environmental changes, even communicate, mimicking what transpires routinely in the biological world. The road to simplest proto-life appears to be opening up.

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