Atomistic Modeling of a New Thermoplastic Polyimide in the Amorphous State: Structure and Energetics

1995 ◽  
Vol 28 (22) ◽  
pp. 7454-7460 ◽  
Author(s):  
Renshi Zhang ◽  
Wayne L. Mattice
Keyword(s):  
Amorphous State ◽  
Atomistic Modeling ◽  
State Structure

scholarly journals Polymers as Natural Nanocomposites. 2. The Comparative Analysis of Reinforcement Mechanisms

2009 ◽  
Vol 3 (3) ◽  
pp. 183-185
Author(s):  
Musa Bashorov ◽  
◽  
Georgiy Kozlov ◽  
Gennady Zaikov ◽  
Abdulakh Mikitaev ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Cluster Model ◽  
Interfacial Adhesion ◽  
Epoxy Polymer ◽  
Amorphous State ◽  
State Structure ◽  
Structure Description ◽  
Adhesion Level

The complete similarity of reinforcement degree behaviour has been shown for nanocomposite epoxy polymer/Na+-montmorillonite and polyarylate, which is considered as the natural nanocomposite. The polyarylate structure description is given within the framework of cluster model of polymers amorphous state structure. The interfacial adhesion level influences strongly the reinforcement degree of indicated materials.

Role of boundaries in the crystallization of amorphous films

1988 ◽  
Vol 46 ◽  
pp. 626-627
Author(s):  
D. A. Smith
Keyword(s):  
Low Temperature ◽  
Amorphous State ◽  
Nucleation And Growth ◽  
Amorphous Films ◽  
Island Nucleation ◽  
Surface Steps ◽  
Transmission Electron ◽  
Component Systems ◽  
Temperature Deposition

The nucleation and growth processes which lead to the formation of a thin film are particularly amenable to investigation by transmission electron microscopy either in situ or subsequent to deposition. In situ studies have enabled the observation of island nucleation and growth, together with addition of atoms to surface steps. This paper is concerned with post-deposition crystallization of amorphous alloys. It will be argued that the processes occurring during low temperature deposition of one component systems are related but the evidence is mainly indirect. Amorphous films result when the deposition conditions such as low temperature or the presence of impurities (intentional or unintentional) preclude the atomic mobility necessary for crystallization. Representative examples of this behavior are CVD silicon grown below about 670°C, metalloids, such as antimony deposited at room temperature, binary alloys or compounds such as Cu-Ag or Cr O2, respectively. Elemental metals are not stable in the amorphous state.

Structures and crystallization of vacuum-deposited amorphous Se and Sb films

1990 ◽  
Vol 48 (4) ◽  
pp. 140-141
Author(s):  
Makoto Shiojiri ◽  
Toshiyuki Isshiki ◽  
Tetsuya Fudaba ◽  
Yoshihiro Hirota
Keyword(s):  
Monte Carlo ◽  
Electron Microscope ◽  
Monte Carlo Method ◽  
Computer Program ◽  
Radial Distribution ◽  
Film Formation ◽  
Amorphous State ◽  
Two Dimensional ◽  
Amorphous Films ◽  
Binding Condition

In hexagonal Se crystal each atom is covalently bound to two others to form an endless spiral chain, and in Sb crystal each atom to three others to form an extended puckered sheet. Such chains and sheets may be regarded as one- and two- dimensional molecules, respectively. In this paper we investigate the structures in amorphous state of these elements and the crystallization.HRTEM and ED images of vacuum-deposited amorphous Se and Sb films were taken with a JEM-200CX electron microscope (Cs=1.2 mm). The structure models of amorphous films were constructed on a computer by Monte Carlo method. Generated atoms were subsequently deposited on a space of 2 nm×2 nm as they fulfiled the binding condition, to form a film 5 nm thick (Fig. 1a-1c). An improvement on a previous computer program has been made as to realize the actual film formation. Radial distribution fuction (RDF) curves, ED intensities and HRTEM images for the constructed structure models were calculated, and compared with the observed ones.

Microstructure of YBa2Cu3O7-x thin films deposited by dc sputtering

1989 ◽  
Vol 47 ◽  
pp. 172-173
Author(s):  
O. Eibl ◽  
G. Gieres ◽  
H. Behner
Keyword(s):  
Thin Films ◽  
Cross Sections ◽  
Intermediate Layer ◽  
Amorphous State ◽  
Critical Currents ◽  
Dc Sputtering ◽  
State Process ◽  
Diffraction Patterns ◽  
Film Substrate ◽  
Substrate Temperatures

The microstructure of high-Tc YBa2Cu3O7-X thin films deposited by DC-sputtering on SrTiO3 substrates was analysed by TEM. Films were either (i) deposited in the amorphous state at substrate temperatures < 450°C and crystallised by a heat treatment at 900°C (process 1) or (ii) deposited at around 740°C in the crystalline state (process 2). Cross sections were prepared for TEM analyses and are especially useful for studying film substrate interdiffusion (fig.1). Films deposited in process 1 were polycristalline and the grain size was approximately 200 nm. Films were porous and the size of voids was approximately 100 nm. Between the SrTiO3 substrate and the YBa2Cu3Ox film a densly grown crystalline intermediate layer approximately 150 nm thick covered the SrTiO3 substrate. EDX microanalyses showed that the layer consisted of Sr, Ba and Ti, however, did not contain Y and Cu. Crystallites of the layer were carefully tilted in the microscope and diffraction patterns were obtained in five different poles for every crystallite. These patterns were consistent with the phase (Ba1-XSrx)2TiO4. The intermediate layer was most likely formed during the annealing at 900°C. Its formation can be understood as a diffusion of Ba from the amorphously deposited film into the substrate and diffusion of Sr from the substrate into the film. Between the intermediate layer and the surface of the film the film consisted of YBa2Cu3O7-x grains. Films prepared in process 1 had Tc(R=0) close to 90 K, however, critical currents were as low as jc = 104A/cm2 at 77 K.

Powers of the Federal Labor Inspectorate: Problems of Implementation of the State’s Supervisory Function in the Digital Economy

2020 ◽  
pp. 52-56
Author(s):  
Apollinariya Aleksandrovna Sapfirova ◽  
Victoria Gagikovna Oganesyan ◽  
Alina Vadimovna Podgornaya
Keyword(s):  
Surveillance System ◽  
Digital Economy ◽  
Administrative Reform ◽  
Document Management ◽  
Labor Rights ◽  
Electronic Surveillance ◽  
State Structure ◽  
Supervision System ◽  
Electronic Signature ◽  
Legal Nature

This paper discusses the implementation of the Federal labor Inspectorate’s powers in the digital economy during the ongoing administrative reform. The effectiveness of this state structure is affected by its dual legal nature, such as the power of labor inspectors is aimed at protecting the rights of em-ployees. In the conditions of the digital economy and the presence of a pandemic, labor rights are fully protected, and the power of Rostrud is limited in relation to supervised objects by prohibiting cer-tain inspections. Under current conditions, the most essential activity of Rostrud is the need to form an electronic supervision system based on the results of the ongoing legal experiment on the introduction of electronic personnel document management. The use of an electronic signature in the activities of Rostrud is the first step in the possibility of imple-menting an electronic surveillance system, which was catalyzed by the pandemic. We believe that elec-tronic supervision will be the next stage of moderni-zation of Rostrud’s activities in the digital economy.

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