Dynamic Mechanical Testing to Evaluate Radiation Induced Changes in Polymers

1966 ◽  
Vol 39 (4) ◽  
pp. 1268-1275 ◽  
Author(s):  
R. K. Teaeger
Keyword(s):  
Mechanical Testing ◽  
Radiation Effects ◽  
Dynamic Testing ◽  
New Approach ◽  
Dynamic Mechanical ◽  
Temperature Spectra ◽  
Radiation Induced ◽  
Dynamic Mechanical Testing ◽  
Effects Of Radiation ◽  
Induced Changes

Abstract Dynamic mechanical testing is one of the most useful tools for evaluating effects of radiation on polymers. Present property-temperature spectra provide molecular and mechanical information. Property-time spectra are of more fundamental interest but present molecular theories or molecular descriptions of phenomenological theories are too limited to allow interpretations of the spectra. The application of dynamic testing to specimens in a radiation field is a new approach to radiation effects studies and has great potential for further understanding the interaction of radiation with polymers.

Oral Sequelae of Head and Neck Radiotherapy

2003 ◽  
Vol 14 (3) ◽  
pp. 199-212 ◽  
Author(s):  
A. Vissink ◽  
J. Jansma ◽  
F.K.L. Spijkervet ◽  
F.R. Burlage ◽  
R.P. Coppes
Keyword(s):  
Head And Neck ◽  
Neck Region ◽  
Normal Tissues ◽  
Radiation Caries ◽  
Temporomandibular Joints ◽  
Clinical Consequences ◽  
Radiation Induced ◽  
Heavy Burden ◽  
Effects Of Radiation ◽  
Induced Changes

In addition to anti-tumor effects, ionizing radiation causes damage in normal tissues located in the radiation portals. Oral complications of radiotherapy in the head and neck region are the result of the deleterious effects of radiation on, e.g., salivary glands, oral mucosa, bone, dentition, masticatory musculature, and temporomandibular joints. The clinical consequences of radiotherapy include mucositis, hyposalivation, taste loss, osteoradionecrosis, radiation caries, and trismus. Mucositis and taste loss are reversible consequences that usually subside early post-irradiation, while hyposalivation is normally irreversible. Furthermore, the risk of developing radiation caries and osteoradionecrosis is a life-long threat. All these consequences form a heavy burden for the patients and have a tremendous impact on their quality of life during and after radiotherapy. In this review, the radiation-induced changes in healthy oral tissues and the resulting clinical consequences are discussed.

Discussion the Rheological Properties of Asphalt Rubber

2014 ◽  
Vol 665 ◽  
pp. 183-187
Author(s):  
Yong Jun Meng ◽  
Yun Tian Jiang ◽  
Yi Yuan Wang ◽  
Yong Qing Shi ◽  
Mou Fen Huang
Keyword(s):  
Rheological Properties ◽  
Mechanical Testing ◽  
Modified Bitumen ◽  
Rubber Powder ◽  
Modified Asphalt ◽  
Dynamic Mechanical ◽  
Asphalt Rubber ◽  
Dynamic Mechanical Testing

To test the effects of crumb rubber's mesh and parameters to rubber asphalt to improve the performance of asphalt, we use different mesh rubber powder and asphalt to prepare rubber asphalt in the laboratory, and do dynamic mechanical testing to rubber asphalt sample. We find that different mesh rubber powder have obviously different action to improve the performance of asphalt. Under the same conditions, in order to make better use of modified bitumen. We propose how to use modified asphalt prepared by different mesh rubber powder for different paving.

Effect of Two Graded Doses of Whole-Body X-Irradiation and Radioprotection by the Use of S-Phenethyl Formamidino 4 (N-Ethyl Isothioamide) Morpholine Dihydrochloride

1983 ◽  
Vol 22 (05) ◽  
pp. 237-245 ◽  
Author(s):  
P. K. Chaturvedi ◽  
S. N. Pandeya ◽  
S. S. Hasan
Keyword(s):  
Radiation Effects ◽  
Whole Body ◽  
X Irradiation ◽  
Radiation Induced ◽  
Induced Changes ◽  
The Brain

The protection offered by a newly synthesized compound (S-phenethyl-formamidino-4(N-ethyl isothioamide) morpholine dihydrochloride) against radiation effects on DNA, RNA and protein biosynthetic processes in the brain, and on metabolites of 5-HT and nor-adrenalin, i.e., 5-HIAA and VMA, in the urine, including the radiobiological damage to thyroid and testes, was evaluated. The use of the compound prior to irradiation prevented radiation-induced changes in the thyroid and testes. The radiation-induced alterations in the pattern of DNA, RNA, protein in the brain, and in 5-HIAA and VMA in urine could be averted by treatment with this compound prior to each dose of X-irradiation.

scholarly journals Fine-Grain Circuit Hardening Through VHDL Datatype Substitution

Electronics ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 24 ◽  
Author(s):  
Maria Muñoz-Quijada ◽  
Samuel Sanchez-Barea ◽  
Daniel Vela-Calderon ◽  
Hipolito Guzman-Miranda
Keyword(s):  
Radiation Effects ◽  
Digital Circuits ◽  
Fault Injection ◽  
Description Language ◽  
New Approach ◽  
Internal Memory ◽  
Fine Grain ◽  
Radiation Induced ◽  
Hardware Description ◽  
Modular Redundancy

Radiation effects can induce, amongst other phenomena, logic errors in digital circuits and systems. These logic errors corrupt the states of the internal memory elements of the circuits and can propagate to the primary outputs, affecting other onboard systems. In order to avoid this, Triple Modular Redundancy is typically used when full robustness against these phenomena is needed. When full triplication of the complete design is not required, selective hardening can be applied to the elements in which a radiation-induced upset is more likely to propagate to the main outputs of the circuit. The present paper describes a new approach for selectively hardening digital electronic circuits by design, which can be applied to digital designs described in the VHDL Hardware Description Language. When the designer changes the datatype of a signal or port to a hardened type, the necessary redundancy is automatically inserted. The automatically hardening features have been compiled into a VHDL package, and have been validated both in simulation and by means of fault injection.

Dynamic mechanical testing system for Raman microscopy of bone tissue specimens

2005 ◽  
Vol 38 (1-2) ◽  
pp. 101-105 ◽  
Author(s):  
Andrew F. Callender ◽  
William F. Finney ◽  
Michael D. Morris ◽  
Nadder D. Sahar ◽  
David H. Kohn ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Mechanical Testing ◽  
Raman Microscopy ◽  
Testing System ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Testing ◽  
Tissue Specimens
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