86,622 research outputs found
Possible Evidence of Piezonuclear Alpha Emission
No full textCompression cycles at different loading speeds, each followed by a rapid stress release, were applied to cylindrical AISI 304 steel bars with 500 g mass, 2 cm diameter and 20 cm height. Three ZnS scintillators and a Geiger counter were placed around the samples. The emission of ionizing particles was both recorded by the Geiger and by the alpha particles counters during the compression and decompression phases. The recorded counts-rates as a function of the load are here shown and commented
DEFORMED SPACE-TIME OF THE PIEZONUCLEAR EMISSIONS
No full textIn this paper, an experimental verification of the relationship between the deformed Minkowsky space-time and the piezonuclear emission has been obtained by testing several cylindrical steel bars cyclically loaded in a mechanical fatigue machine. During the compression cycles, α-particles have been both detected by a ZnS(Ag) scintillator and a Geiger counter. Taking into account the theory of the deformed special relativity, we report that the emission only occurs after a specific value of energy is overcome. This value is strictly related to the weak and strong nuclear interactions, which in turn define the regions of Minkowsky and non-Minkowsky space-time
Statistics of piezonuclear emissions: early results
No full textMeasurements of ionizing and nonionizing particles are performed during the rupture tests of steel rods having different diameter. A ZnS(Ag) alpha detector, a Geiger counter and a 3He proportional counter for neutrons are used. From the distributions of the recorded intensity maxima, different particles emissions are suggested to occur in broken and nonbroken samples. A hint for the emission of neutrons at rupture is also obtained. Such neutron emissions are predicted in the framework of the piezonuclear theory
3D strain state analysis in Nb3Sn multifilamentary strand bundles using neutron diffraction
No full textChemical changes induced by ultrasound in iron
No full textThe focus of this work is a careful chemical investigation of structural damage produced by the exposure of an iron bar to pressure waves generated using an ultrasound machine (called the R-1-S reactor).
In addition to the emission of neutron bursts, the ultrasound treatment caused the appearance of zones of macroscopic damage (∼1 mm in size) on the exterior of the bar. Reflected-light optical and environmental scanning electron microscopy (ESEM) has shown that these external damage zones are characterized by microcraters and are covered by a thin layer of cracked amorphous material. Under back scattered electron (BSE) observation, this material shows a lower brightness than the intact ferrite surface. In addition, a zone with a high density of deformed cavities (∼1300 per mm2) with irregular walls and a maximum size of 10 μm was found inside the bar. These deformed microcavities are partially filled with a material composed of a chaotic assemblage of submicron-sized (most likely amorphous) particles.
A careful compositional investigation of the chaotic material inside the microcavities using the semi-quantitative data obtained with the ESEM X-ray Energy Dispersive System (EDS) has shown that it is primarily composed of carbon, manganese and chromium. These elements are also found in lower amounts within the intact ferrite matrix. In contrast, the damaged surface surrounding the craters is characterized by elements not found in the ferrite at all (i.e., O, Cl, K, Cu); elements the presence of which cannot be attributed to the occurrence of non-metallic inclusions or to contamination during fabrication.
These results are also difficult to explain using the generally accepted laws of physics; however, they do appear to agree with a recent theory predicting the deformation of the local spacetime and the violation of the Local Lorentz Invariance. Such a violation should occur following the collapse of micron-sized discontinuities internal to the materials (micropores) exposed to ultrasonic pressure waves resulting in an energy density to time ratio large enough to overcome the threshold predicted by the deformed spacetime theory, triggering, in this way, a new kind of nuclear reaction. Following this theory, the C-, Mn- and Cr-rich chaotic material inside the microcavities is the product of the spherically symmetrical collapse of micropores internal to the ferrite while the presence of new elements within the cratered damage zones on the ferrite surface can be attributed to the catastrophic collapse of the subsurface pore walls resulting from microexplosions
Piezonuclear reactions and DST-reactions
No full textOver the past two decades a great deal of evidence has been gathered about the existence and the possible energetic exploitation of a new type of reactions predicted by the Deformed Special Relativity, which is an extension of Special Relativity. According to that theory, the energy of every physical phenomenon determines, by deforming it, the space-time in which the same phenomenon evolves. The practical consequences of this theoretical prediction are that mechanical machines, such as ultrasound generators or other compressing equipments, can also induce nuclear reactions on systems consisting of stable atoms such as iron, if they are able to trigger some particular physical effects able to concentrate an adequate amount of energy in an adequate space-time region. The experimental research aims at converting those predictions into experimental results and, in perspective, into industrial prototypes for a following commercial use. The evidence of nuclear transmutation of elements is among the most interesting possible results. Neutron and alpha particles emission are also reported
Evidence of alpha emission from compressed steel bars
No full textFour cylindrical steel bars of 2 cm diameter and 20 cm height were subjected to compression cycles each of them consisting of a loading phase at fixed stress rate followed by a rapid stress release. Different compression rates were used for the same sample. The area surrounding the loaded samples was monitored in order to check whether ionizing particles were emitted. To this aim, three ZnS(Ag) detectors, a Geiger counter, and some polycarbonate CR39 detectors of alpha particles were used. An 3He proportional detector of neutrons was also used. The whole set of results is discussed and proposed
as an evidence of alpha particles emission from the bars during the compression cycles
Neutron diffraction measurement of residual stresses in CFC/Cu/CuCrZr joints for nuclearfusion technology
No full textWall motion at 4D-CT angiography and surgical correlation in unruptured intracranial aneurysms: a pilot study.
No full textBACKGROUND:
Unruptured intracranial aneurysms (UIAs) are reported more frequently nowadays but their management is not well established; it depends on different structural features of the aneurysms and on multiple patient's risk factors. With this prospective observational study we report our preliminary experience by using four-dimensional (4D) computed tomographic (CT) angiography with ECG-gated reconstructions in the evaluation of dynamic modifications of the aneurysm wall, as a potential predicting factor of growth or rupture. The novelty of this study consists in correlation between Angio 4D-CT angiography images and surgical findings; only few scientific papers, in fact, have studied this issue.
METHODS:
Thirty-one patients (1 male, 30 females; 59.0±12.7 years old) with 43 unruptured aneurysms (medium size: 5.2±3.0 mm) were studied. ECG-triggered 4D-CT angiography was performed with a 320-detector CT system (Aquilion ONE; Toshiba Medical Systems Corporation, Japan); ECG-gated reconstruction was performed for visualizing local displacement of the aneurysmal wall over a heart cycle. In the aneurysms surgically treated in our institution we were able to compare the macroscopic features of the aneurysm wall with 4D-CTA findings. We performed long-term follow-up on untreated patients.
RESULTS:
Pulsation was detected in 13 of 43 unruptured aneurysms. Eighteen aneurysms were treated: thirteen were surgically treated and five underwent embolization with detachable coil placement. In nine aneurysms surgically treated in our institution (5 with pulsation and 4 without) we observed a significant correlation between 4D-CTA findings and macroscopic features of the aneurysms wall, in particular the pulsations detected at 4D-CTA study have shown to correspond to dark-reddish thinner wall at surgery.
CONCLUSION:
Our data confirm the previous reports concerning the reliability of 4D-CT angiography with ECG-gated reconstructions in defining the dynamic and structural features of the aneurysm wall. Moreover, optimal correlation rate between the findings provided by the 4D-CTA and the macroscopic surgical evaluation support a possible role of this technique to identify aneurysms with a higher risk of rupture
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