Internal Friction Studies on Oxygen–Oxygen Interaction in Niobium. I. Experimental Results and Application of Previous Interpretations

1992 ◽  
Vol 172 (1) ◽  
pp. 145-159 ◽  
Author(s):  
M. Weller ◽  
G. Haneczok ◽  
J. Diehl
Keyword(s):  
Internal Friction ◽  
Experimental Results ◽  
Oxygen Oxygen ◽  
Oxygen Interaction

Crystal Structure of 1-(2,4,6-Trichlorobenzoyloxy) Benzotriazole (TCB-OBt): Observation of uncommon intermolecular oxygen-oxygen interaction and synthetic application in amidation

2021 ◽  
Author(s):  
Gobinda Dolai ◽  
Sayanta Roy ◽  
Srijit Sen ◽  
Rajat Subhra Giri ◽  
Bhubaneswar Mandal
Keyword(s):  
Crystal Structure ◽  
Supramolecular Assembly ◽  
Hirshfeld Surface ◽  
Oxygen Oxygen ◽  
Synthetic Application ◽  
Oxygen Interaction

Herein, we investigated the supramolecular assembly of a Modified Yamaguchi Reagent TCB-OBt. Interestingly, each molecule is interconnected through novel chalcogen-chalcogen (O…O) interaction, - stacking, and aromatic C-H…O interaction. Hirshfeld surface...

Experiment on the Attenuation Characteristics of Shock Wave Interacting with Open and Closed Foam

2014 ◽  
Vol 1035 ◽  
pp. 445-452
Author(s):  
Jian Wang ◽  
Bao Gui Wang ◽  
Gang Tao
Keyword(s):  
Shock Wave ◽  
Internal Friction ◽  
Dynamic Behavior ◽  
Solid Phase ◽  
Experimental Results ◽  
Reflection And Transmission ◽  
Attenuation Characteristics

For understanding the dynamic behavior of open and closed foam subject to a shock wave, this paper through experiments, to gain a deeper understanding of the incidence, reflection and transmission of a shock wave when it interacted with cellular foam. Moreover, by analyzing the loss of the peak overpressure and positive impulse, we were able to respectively know the positive impulse of the incidence, reflection and transmission shock wave. The experimental results indicated that the attenuation capability for foam to the shock wave was caused by the internal friction and deformation of solid phase, which would absorb the energy of the shock wave. From the results we gain an understanding that the mechanical phenomenon of open foam to shock wave are not fully consistent with those of closed foam , while the attenuation of open foam to shock wave is more effective than that of closed foam.

Internal friction and Mössbauer study of C–Cr associates in MANET steel

1997 ◽  
Vol 12 (2) ◽  
pp. 296-299 ◽  
Author(s):  
P. Gondi ◽  
R. Gupta ◽  
R. Montanari ◽  
G. Principi ◽  
M. E. Tata
Keyword(s):  
Internal Friction ◽  
Slow Rate ◽  
Structural Model ◽  
Martensitic Steel ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Mössbauer Study ◽  
Low Intensity ◽  
Magnetic Pattern ◽  
Bcc Phase

Internal friction and Mössbauer techniques have been used to investigate the structure of C–Cr associates and the arrangement of Fe atoms near them in the Cr martensitic steel MANET subjected to different thermal treatments. After slow rate cooling from the austenitic field, the Mössbauer spectra exhibit, besides the complex magnetic pattern of martensite, a low intensity singlet attributed to the presence of a Cr-rich bcc phase. In correspondence, the internal friction curves, show, among others, a Snoek-type peak due to anelastic processes involving C–Cr associates with 6 Cr atoms. To explain the experimental results, a simple structural model is suggested.

Plastic Behaviour of Green Powder Metallurgical Compacts

2007 ◽  
Vol 534-536 ◽  
pp. 305-308
Author(s):  
Jose Manuel Prado
Keyword(s):  
Plastic Deformation ◽  
Internal Friction ◽  
Uniaxial Compression ◽  
Mechanical Behaviour ◽  
Experimental Results ◽  
Compression Tests ◽  
Contact Areas ◽  
Plastic Behaviour ◽  
Different Levels ◽  
Cam Clay

The results of monotonic and cyclic uniaxial compression tests, in which the deviatoric component of the stress is predominant, carried out on green and recrystallized iron compacts with different levels of density are presented and discussed in order to analyse the macro and micromechanisms governing the mechanical behaviour of non-sintered PM materials. The plastic deformation of the particles, especially at the contact areas between neighbouring particles, produces an internal friction responsible for the main features observed in the behaviour of green metallic compacts. These experimental results show important discrepancies with the plasticity models, Cam-Clay and Drucker-Prager Cap, used to simulate the powder compaction stage. Possible causes for these discrepancies are pointed out.

The Mechanical Properties for the Attenuation of Shock Wave Interaction with Watery Foam Material

2013 ◽  
Vol 815 ◽  
pp. 558-566 ◽  
Author(s):  
Jie Zhou ◽  
Gang Tao
Keyword(s):  
Mechanical Properties ◽  
Shock Wave ◽  
Internal Friction ◽  
Dynamic Behavior ◽  
Wave Interaction ◽  
Experimental Results ◽  
Foam Material ◽  
Reflection And Transmission ◽  
Shock Wave Interaction ◽  
Water Atomization

For understanding the dynamic behavior of watery cellular foam subject to a shock wave, this paper through experiments, to gain a deeper understanding of the incidence, reflection and transmission of a shock wave when it interacted with watery foam. Moreover, by analyzing the loss of the peak overpressure and positive impulse, we were able to respectively know the positive impulse of the incidence, reflection and transmission shock wave. The experimental results indicated that the attenuation capability for watery foam to the shock wave was caused by the internal friction and the water atomization, which would absorb the energy of the shock wave. Therein, the higher percentage of water in the cellular foam, the more obvious attenuation phenomenon for the shock wave was presented. However, the mechanical processes of cellular foam with different water percentages subject to the shock wave were not completely consistent.

scholarly journals Rotor Instability Induced by Radial Clearance in Ball Bearing Supports

1993 ◽  
Author(s):  
Yao-Qun Lin
Keyword(s):  
Experimental Investigation ◽  
Internal Friction ◽  
Natural Frequency ◽  
Computer Simulations ◽  
Ball Bearing ◽  
Rotor Dynamics ◽  
Experimental Results ◽  
Radial Clearance ◽  
Speed Range ◽  
Theoretical Predictions

In rotor dynamics, the rotor nonsynchronous natural frequency vibration, or rotor instability, has been mainly ascribed to two mechanisms, i.e., internal friction effects and fluid actions. It is shown, however, in this paper that the radial clearance in ball bearing supports can also induce rotor instability through an internal-impacts mechanism. The behavior of the rotor with radial clearance in its ball bearing supports is simulated numerically. The computer simulations show that there is a speed range in which the rotor will vibrate at both the synchronous frequency and the natural frequency. Below or above this speed range, the rotor has only the synchronous response and its harmonics. An experimental investigation was conducted to verify this analysis. The experimental results agree well with the theoretical predictions.

Characterizing the Oxygen−Oxygen Interaction in the Dinitramide Anion

2002 ◽  
Vol 124 (17) ◽  
pp. 4574-4575 ◽  
Author(s):  
Elizabeth A. Zhurova ◽  
Vladimir G. Tsirelson ◽  
Adam I. Stash ◽  
A. Alan Pinkerton
Keyword(s):  
Oxygen Oxygen ◽  
Oxygen Interaction
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